Just as Lucky gives a heartfelt goodbye to Liz, the tunnel caves in and buries him alive. Liz races against time to get him out from under the rubble. Luke finds them and helps Liz uncover Lucky. Once he's uncovered, they're both relieved to know that Lucky is still alive. Luke realizes that Lucky isn't breathing, though.
Courtney, Sonny, and Nikolas try to clear the passage to get to Lucky and Liz. Sonny realizes that Reese is in pain, so he asks her to sit with Alexis instead of helping to remove debris. Reese is resistant at first, but decides to go sit with Alexis when Ric goes to help Emily find medical supplies. Before Ric leaves, Alexis and Ric talk about their relationship. Alexis finds it funny that they can only get along when their lives are a chaotic mess. Ric tells her they both need excitement, which is why they thrive on chaos. Alexis tells him she needs him to come back, though, and they kiss before he rushes off to help Emily. Reese tries to sit with Alexis, but Alexis assures her she doesn't need her company. Reese tells her to stop being stubborn and allow her to help for her baby's sake. While they talk, Ric asks Emily how Alexis is doing. Emily hesitates and Ric asks her what's wrong. Before she can answer, Nikolas tells her Alexis needs her. The contractions are closer together now and Alexis is dilated to 6. Ric asks her what they would do for Alexis at a hospital, and Emily tells them they would do a c-section.
Jason cuts the rope Luke tied to him and rushes off to find Sam. He finds Carly, though he doesn't recognize her. He warns her about the threat of fire and Carly grabs the fire extinguisher to put out the sparks from the electrical wires. As she dashes off, Jason spots Robin lying in the floor and thinks it is Sam. She wakes up and he realizes its Robin. She tells him that Sam went off to get help and wants him to go find her. Jason hesitates but runs off to find Sam. He finds her not too far away, buried in the ruble. He uncovers her and she wakes up. He helps her stand up, despite her protests that he's not in the hospital. They go back to try to help Robin get out from under the seats that have her pinned inside the train car. Meanwhile, Max tries to stop Carly from heading out of the ruble, but he's gunned down by Manny. Carly grabs a pipe and asks if she's who he's been looking for.
Skye runs to the scene of the accident and finds Alcazar already there. When she asks what he's doing there, she realizes something is up. She puts two and two together and discovers that Carly was on the train coming into Port Charles. She realizes that Alcazar thinks Carly caused the accident. Tracy stops any further conversation by accusing Skye of allowing Luke to go in after Lucky. She thinks that Skye would rather see Luke dead than with any other woman. Skye denies this and tells her he was only going in after his son. Jax comes stumbling out of the tumble and receives oxygen while the paramedics check him over. Mac realizes he's determined to go back in and wants to stop him. Jesse thinks it's a good idea to let Jax go back in, though, because he knows more than the rescuers do at this point. Jesse promises Mac that he will do everything possible to save Robin. Alcazar agrees to go help Jax, but before they rush off, Skye hugs Alcazar in defeat of his love for Carly. Tracy watches the exchange and asks Skye whose husband she is wringing her hands over, hers or Carly's? Much to Skye's disbelief, Lulu convinced Georgie to take her back to the scene after she dropped her off at home. Lulu told Georgie she was going to help her Aunt Bobbie, but Georgie realizes it's all a scam once they arrive. They run into Jesse, who tells them that Lucky is hurt. George tries to convince her to stay out of the way, but Lulu says she's been staying out of the way all her life. If she has to yell and scream and get in the way in order to get her brothers out alive, that's what she's going to do.
Dr. Winters vents her frustration to Justice about Jax refusing medical treatment. Justice calms her down by telling her she's doing all that she can for those people that want medical care.
Back at the hospital, Monica and Alan receive word that a male is being air-lifted to the hospital from the train wreck. He's sustained minor injuries, but appears to be unconscious from a possible seizure. They both assume the worst and fear its Jason, but are relieved when another man is wheeled into the hospital. Alan tells Monica he has a feeling that both Jason and Emily will make it through this ordeal.
Liz performed CPR until Lucky started breathing on his own again. Lucky woke up as Luke and Liz were arguing. Luke wanted to get Lucky out of the tunnel, but Liz thought it was too dangerous to move him. Lucky spoke up and told them that his father was right. Nikolas went to say goodbye to Alexis, Emily, and Courtney, while Liz and Luke prepared Lucky for the move. When Nikolas returned, he and Luke carried Lucky toward the entrance Luke had entered through. Nikolas and Luke put down Lucky so they could dig through the additional rubble that blocked the entrance.
As they continued to dig, they head voices. Alcazar and Jax were on the other side of the blocked entrance. They all heard each other and dug a hole large enough for Luke and Nikolas to pass Lucky through. Jax and Alcazar got Lucky through, but the hole collapsed as Luke tried to crawl through. He made it, through, and they rushed Lucky to triage in order to get him to the hospital as soon as possible.
Back in the hole, Nikolas and Liz realized they were trapped. As Liz broke down, both she and Nikolas started to cough. Liz passed out, and Nikolas realized there were gasses in the chamber that were affecting them. Before he could find a way out, he collapsed with Liz in his arms.
Emily told Ric and Alexis that if the contractions didn't stop, both Alexis and the baby could be at risk. Emily found an asthma drug that she thought might help slow the contractions down. She couldn't give advice, but she could offer the drug to Alexis so that Alexis could make the decision. After another strong contraction, Alexis decided to take the medicine. While they waited for the drug to work, Ric apologized to Alexis, and she admitted she'd always wanted him with her when the baby was born. The drug did slow the contractions down, but Alexis continued to dilate. The baby was stuck high up in the pelvis, so if they didn't get Alexis out soon, the baby could still die.
Carly was able to get a good swing at Manny, but she didn't get very far before he grabbed her again. She saw Max's gun lying next to him and made an attempt to grab it. Manny saw what she was doing and tried to keep her away from the gun. Another segment of the tunnel caved in, and Carly grabbed a rock and hit Manny on the head. She ran back to the train car and hid behind a seat. Manny went looking for her but couldn't find her until she knocked over a briefcase in an attempt to get another gun. Carly grabbed the gun and ran back behind the seat, but Manny was already heading her way.
Sam and Jason finally managed to free Robin. As they left the train car, Robin remembered that her medicines and research were still on the train. Jason headed back to get them, but the train exploded before Jason could find the briefcase. He jumped out of the exploding train and knocked himself unconscious. When he woke up, Robin assessed Jason's condition and realized it was much more serious than she had thought.
Jason still thought it was no big deal, but Sam erupted at him. Jason asked her what was bothering her besides the train wreck, and she explained that the day would have been their little girl's first birthday. They all agreed that the best way to help Jason was to find a way out. The three of them found a path up on a ledge, but as they tried to walk across, Robin slipped and fell. She clung to the side of the ledge, while Jason begged her to grab hold of his hand.
Lulu witnessed Skye and Tracy in a heated debate over her father and interrupted, telling them both that her father would never love either one of them. Skye was stunned into silence over Lulu's outburst, but Tracy took the opportunity to tell Lulu she was a selfish, spoiled brat. Skye called Dillon and asked him to rescue Lulu from his mother. Dillon went over and separated the two women then left with Lulu. They bonded over the fact that they both only had one parent and that the one parent was lacking the necessary parenting skills.
When Lulu saw Luke and Lucky emerging from the tunnel, she rushed over to Lucky's side. She realized that Luke had left Nikolas behind, and she started screaming at Luke again. Meanwhile, Georgie vented to Dillon at how selfish Lulu was. Dillon stood up for Lulu, though.
Robin is hanging from the ledge. Jason pulled her to safety. Robin wanted Jason to rest and not to stain himself, and Sam agreed with Robin. Jason claimed he couldn't rest because there might be another cave-in. Robin told Jason that he hasn't changed -- he still doesn't listen to people. Jason admitted that he was having another headache, but wanted them to keep moving. Jason found a St. Christopher metal in the tunnels. It caused him to have a flash back about Carly. In the flashback he remembered giving her a St. Christopher necklace in the hospital after she had Michael. The medal was to protect her and help to remind her of Michael so that she could come back to him.
Carly held a gun and hid behind a row of seats as Manny taunted her. Manny shot at the seats where she was hiding. Manny went to check to see if he shot Carly, but she wasn't there. Manny told Carly that she couldn't run forever. Carly stood up and shot Manny. She missed, but a shootout began. It ended with Manny being shot. Carly fled the train car and went into the tunnels. Carly realized that she lost her St. Christopher metal and headed back to the train cars.
Liz and Nikolas passed out from a gas leak. Later, Nikolas stopped the leak and the two of them talked about what they will do when they get out of here. Liz told Nikolas that she will find Lucky, go on her honeymoon, take lots of pictures and then have Emily and Nikolas over to Kelly's to look at them. Nikolas said that he couldn't believe that she was still playing matchmaker when they were buried in the tunnels.
Jax is mad a Mac for not being more aggressive in the search and not wanting him there. Jax told Mac that he would find his own way in. Jax found Liz and Nikolas. He had dug out the debris that had collapsed the tunnel. Liz asked about Lucky and found out that he was at the hospital in surgery. Mac asked them if they had seen Robin, they said that they hadn't. Jax and Nikolas refused to leave the area and returned to try to find Courtney. Liz and Luke talked a news helicopter into taking them back to the hospital. They found Lucky as he woke up from surgery. Liz told Lucky how they got out of the tunnel and how Nikolas and Emily were still inside. Lucky started to code.
Alcazar heard that there was an unidentified blond woman who was dead. He went to check to see if it was Carly, it wasn't. Alcazar asked for the blueprints of the train tunnels. After he studied them, he thought that he found a way in.
Sonny and Reese were trapped on both sides of the tunnel they were in. Sonny kept digging while Reese was concerned about Sonny's claustrophobia. Reese asked Sonny if he was afraid of dying. Sonny said that he was not dying here... no one was dying here. Sonny started to see light, they continued to dig. Reese was hiding the fact that she was sicker than she originally thought. Reese coughed up blood. Sonny and Reese ended up in the same train car as Carly. Carly was looking for her St. Christopher necklace. Carly hid when she heard voices. She overheard Sonny telling Reese that she (Carly) may never get out of Rose Lawn. Carly had a flashback of when Sonny left her at Rose Lawn and gave her the charm bracelet. Sonny and Reese heard a noise and demanded that whoever it was, stand up.
Alexis asked Emily if a C-section would save her baby. Emily told her yes. Alexis told Emily that she must save the baby. Alexis' contractions grew stronger. She wanted a C-section. Emily has no experience with this and thought that they need to wait for the rescue team. Jason, Sam and Robin find Alexis, Ric, and Emily. Alexis asked if Robin could perform her C-section. Robin told her that she is HIV-positive, but, yes, she can do it. Alexis told her to do it. They moved Alexis into the train car. Robin needed a knife for the C-section. Jason had one. Robin said that some things never change. Emily and Ric found a sewing kit, a fishing kit and alcohol. They had Alexis drink some of the alcohol and used it for sterilization. Alexis and Ric talked. Alexis told Ric that she is going to die. Ric told her that she won't die. Alexis made Ric promise to take care of her children if she does die. Ric made the promise. Robin and Emily talked about what was about to happen. Robin told Emily that they could get both Alexis and the baby out alive. Alexis is out. They began the C-section. Robin told Ric not to panic, to stay calm and to follow all of her directions.
Jason and Sam left the others. Jason didn't want Sam to see the baby being born. Sam wondered if they should have told them about Manny. Jason didn't think that was necessary because Manny wasn't after any of them. Jason told Sam that he remembered giving a St. Christopher metal, like the one he found, to Carly. As they continued to walk, Jason got a headache and falls from the cliff. Sam jumped down and held him.
Jax and Nikolas find Courtney collapsed on the floor of the tunnels. Courtney woke up. Jax is mad that she didn't stay with the rest of the others and risked herself and the baby. Nikolas told him to relax and concentrate on getting them out. As they did that, the tunnel collapsed on Nikolas. Jax wanted to run, but Courtney refused to leave Nikolas.
Lucky goes into cardiac arrest while Liz and Luke are in his hospital room. Liz calls out for help. A male nurse comes in and starts CPR on Lucky. They are forced to use the paddles on him when he doesn't respond to the CPR. Lucky finally comes around and they get a pulse from him. Lucky wakes up soon after. He thanks Luke for saving his life. Luke tells him to thank his wife instead for being so strong and not giving up on him. Luke leaves his room and runs into LuLu. Lulu surprises Luke by grabbing him and hugging him for saving Lucky's life. She apologizes to him for accusing him of leaving Nikolas behind to save Lucky. She also expresses how hard it has been not to have him around growing up and how other friends of hers always had a father around to do things with. Luke feels bad that she felt that way. Tracy shows up to see him after hearing about Lucky coming around. LuLu resents her presence and makes it clear to her that Luke is only staying married to her because she is a "cash cow" to him. She runs off in a snit. Later, Luke tells Lucky that he is not easy to live with lately with all the life-threatening injuries he has suffered in the last year. Liz assures him that even though he is a lot of trouble to deal with he is well worth it.
Nikolas lays trapped under a heavy beam. Jax tries to help him lift it off of him. Courtney tries to help lift it with him but both Jax and Nikolas tell her to stay back and let them handle it since it isn't good for the baby for her to be lifting like that. Courtney feels helpless to help them but backs off. Suddenly, they hear a rumble nearby and worry about the tunnel collapsing on them. Their worst fears come true when part of the top of the tunnel collapses and lands on top of Nikolas before they can get him out. Courtney frantically tries to get the heavy rocks off of Nikolas. She gets upset when she finds blood near where Nikolas was laying. Jax tries to get the rocks off but they are too heavy and he tells her that they can't stay and must leave the area before more of the tunnel collapses on them. Courtney is reluctant to leave Nikolas. They believe Nikolas could very well be dead. Meanwhile, Robin performs the C-section on Alexis after the alcohol she consumed knocks her out cold. Robin has Emily help her and makes an incision. Robin tells Ric that they need to make a wider incision because the baby is too big and can't fit through her initial incision. Ric gives the o.k. Robin gets the baby out and tells Ric that the baby is a girl. Emily wraps the baby up in a blanket and hands her to Ric. Ric tells Robin that the baby isn't breathing. Robin tells him to breathe into the baby's nose like a straw and cover both nostrils while he does it. He does it but the baby doesn't respond or cry. Robin tells him to make sure to breathe into the baby's nose and cover both nostrils so no air goes out. Ric tries it again and the baby starts to breathe and cry. Ric is elated that it worked. Robin tells him that she needs to sew Alexis up right now or she could hemorrhage. Ric cares for the baby and takes a walk while Robin and Emily work on her. Ric walks out and finds Courtney and Jax. Ric can't get the baby to stop crying so Courtney holds her and calms her down. Ric fills in Jax about Alexis and tells him that Robin showed up and performed the C-section on her. Emily finds them and asks what happened to them. Jax and Courtney are reluctant to tell her about Nikolas but they are forced to tell her what happened to Nikolas. Ric goes back inside with the baby to check on Alexis. Alexis wakes up and feels elated about the baby being born healthy. She tells Ric that it doesn't matter anymore what they were fighting about and that their baby is what is most important to them. Ric kisses Alexis. She decides to name their baby girl Molly after "The Unsinkable Molly Brown", one of their favorite movies. Ric likes the name. Robin examines Alexis by touching her fingers and asking her if she feels her touch. Alexis doesn't feel anything. Robin touches her stomach and presses down and asks Alexis if she feels any pain or discomfort. Alexis tells her she feels fine. Robin becomes more concerned. She approaches Ric, who is holding the baby. Ric thinks Alexis is getting better and will be fine. Robin tells him that Alexis is not getting better and that if they don't get her medical help soon, she could die. This news stuns Ric. Meanwhile, Emily takes the news about Nikolas very hard. Courtney hugs her to comfort her. Nikolas surprises them all when he comes over and is very much alive. Emily runs over to him and hugs him in relief and joy. Courtney can't help but notice her reaction to seeing Nikolas.
Sam goes down the rocks to tend to Jason, who lays there unconscious. Sam tries to get him to wake up but he doesn't respond to her. Sam can't move him onto his back and runs to get help. Meanwhile, Sonny and Reese argue about whether to stay on the train or leave. Suddenly, they hear a noise when Carly tries to hide from them and makes a noise when she moves around in the corner. Sonny and Reese hear the noise and ask who is there. Carly doesn't respond and makes a run for it. Sonny and Reese see a movement but don't realize it is actually Carly. They leave the train and run into Sam. Sam is happy to see Sonny, who she doesn't realize was even on the train. She tells them about Jason's fall and how she needs him to help her move Jason. Carly finds Jason and notices he is laying unconscious in a puddle of water, which is running from a pipe. She manages to drag him out of the water and Jason comes to. Carly reminisces about how she lectured him about how he should dress when he went to court on some criminal charges. Carly hears voices and runs off after making sure Jason was o.k. on his own. Sam, Reese, and Sonny find Jason. Jason tells them that he saw Carly and she helped him. They are surprised by that news since they thought she was safe and sound at Rose Lawn. Sam notices that Reese doesn't look so good and asks how she is doing. Reese acts stoic and tells her she will be fine and has only a minor injury. Sam isn't so sure she isn't playing down how serious her injury really is. Meanwhile, Lorenzo shows Mac and Jesse his idea about how he thinks they can rescue everyone from the tunnel. Mac questions why Lorenzo is being so altruistic and wonders why he is so determined to go into the tunnel again to save people. Skye steps in and covers for him by telling Mac that he shouldn't be suspicious just because Lorenzo wants to help him. Mac tells him he won't let him go back into the tunnel again since he is a civilian. Lorenzo tells Mac that someone is going to have to go into the tunnel who isn't too big is stature. Jesse tells them that he is certified in search and rescue and can go back into the tunnel. Mac ok's it but tells him to call for help if he thinks the tunnel is going to collapse on him and he will make sure to bring him back up immediately. Maxie doesn't like the idea of Jesse going back into the tunnel even though she knows he is going in to rescue Robin, foremost, who is like a big sister to her. Jesse assures her he knows what he is doing and will be careful. Jesse puts a rope around him and goes back into the tunnel. He runs into Carly, who is trying to run away from Reese and Sonny. He tells her he is there to rescue her and helps her out of the tunnel. Lorenzo spots a woman with a hood over her face and realizes it is Carly. He goes over and calls to her. Carly realizes who it is and hugs him in relief. Skye watches from afar.
A dazed Jason tells Sonny and the others about his brief encounter with Carly. Meanwhile, in the triage area, Carly explains to Lorenzo how she fled Rose Lawn to escape from Manny only to have him follow her onto the train. Ric refuses to accept Robin's dire prediction about his wife's weakening condition but Alexis realizes that she's close to death. Certain he would have been notified if his ex-wife had left the sanitarium, Sonny finds Jason's strange tale difficult to believe. Cradling Molly in her arms, Alexis tearfully promises her infant daughter she'll have so many wonderful things to discover in her life because her loving dad will always be there for her. Manny kills a rescue worker for his bag of explosives, then corners Sam when she happens upon the scene. Skye helps Lorenzo cover for Carly before she's recognized by the police. Determined to stay with Alexis, Ric asks Nikolas and Courtney to make sure his newborn baby girl gets safely out of harm's way. Sonny is reunited with Robin as he and Reese help Jason through the tunnels. Later, Alexis tells Sonny she wants him to raise Kristina, then asks Ric and his brother to let Molly know her big sister as she grows up. Robin manages to elude Manny, who proceeds to plant his explosives along the debris path. Lorenzo brings Carly back to Rose Lawn but lies to Dr. Kim about his wife's recent exploits. Sonny, Robin and Sam go back into the wreckage to search for Jason's medication and run smack into Manny. Ric weeps as Alexis' life ebbs away.