Ben, Richard & Miles get C-4 from the barracks, discover Widmore & Zoe

We finally see Ben, Miles and Richard again, making their way through the jungle towards the barracks. Miles questions whether Ben's short cut is accurate and Ben says he lived at the barracks a long time and he knows how to get there. Mile hits back saying he lived there 30 years ago, "otherwise known as last week." It's nice to see a little humor return to the show.

Once they arrrive at the barracks, Miles starts getting that dead body feeling and says that he get "wonky around dead stuff." Ben asks him if he has something to share and before Miles can say anything, Richard says that Alex is buried there. He says that he buried Alex's body after Ben left the island. Ben pauses and looks down at the ground then thanks Richard.

They then enter Ben's old house where he immediately moves the bookcase, revealing his secret room. Miles notices the door where Ben summoned the smoke monster and asks what it is. Ben says that it is where he was told he could summon the smoke monster, but he now knows that it was really summoning him.

Behind the hanging shirts, there is a safe that Ben opens to reveal six bricks of C-4. Ben asks Richard if they want to cripple the plane or "blow it to hell," and Richard chooses the latter, so they take a six bricks.

They suddenly hear a noise, and leave the room to discover Zoe in the kitchen. They point their rifles at her and Ben asks who she is. Then Charles Widmore enters house and says that she' with him. Ben looks completely stunned to see Widmore.

Sayid sacrifices himself, is killed by C-4 explosion

As the group examines the bomb which is still slowly ticking down, Jin calls Frank in the control room and tells him to have the captain surface the submarine. The captain has to reverse the submarine which is currently diving.

Jack tells the group that Locke put the explosives in the bag. Jin says that Locke wanted to come with them so why would he do that. Sawyer says that's why he shut Locke out. Jack tells them that Locke wanted to be shut out.

Sayid tells them that the watch has been jury-rigged to the explosives and the battery will set off the C-4. Frank tells Sawyer that it'll be at least five minutes before the submarine can surface. Sayid then says that if they disconnect two wires that are the leads from the watch, the bomb should be inert. He adds that they have to disconnect them simultaneously and then says "I'm not sure..." but is interrupted by Sawyer who steps forward.

Jack tells Sawyer to wait and not to pull the wires because they'll all be okay. Obviously, Sawyer objects strongly, saying that if he doesn't pull the wires, Locke will kill them. Jack says that Locke can't kill them and this is what Locke wanted. He says that Locke wanted to get them all in an enclosed space with no hope to get out. He says that Locke said he can't leave the island without them, but Jack thinks that Locke can't leave until they're all dead. Locke claimed he could kill them whenever he wanted, but Jack says what if he's not allowed to and he's trying to get them to kill each other.

Sawyer tells him to stay out of his way and Jack adds why would Locke put the timer on it and not just throw it in if he could kill them himself. Jack grabs Sawyer and asks him to trust him that nothing will happen. Sawyer says he doesn't and pulls the wires. The timer stops at 1:31 and everybody looks relieved. A moment later, the timer then starts again but is accelerated.

Sayid steps up and tells Jack that there is a well on the main island half a mile south of the camp they were just at. He says that Desmond is inside it and Locke wanted him dead, so Jack is going to need him. Jack asks why he's telling him this and Sayid then says "Because it's going to be you, Jack."

Sayid grabs the bomb and runs down the hallway. The bomb explodes, killing Sayid, who has sacrificed himself to give the others a chance to survive. It was quite a quick death for our original castaway from season one. I guess there's not time to left to stop and be emotional about a character who has essentially been a zombie most of the season.

We'll stop there and pick things up in the next post, but this part of the scene is heavy, with Jack once again seeming to figure out the rules of the game. So in theory, if Sawyer and the others wouldn't have interfered with the bomb, they would have lived, but since he got involved, he became the killer. So it seems that the candidates can kill each other, but Locke and possibly other people and forces cannot.

Jack finds the C-4 in the bag Locked swapped with his

As the submarine dives into the ocean, Jack is trying to treat Kate's bullet wound. Kate asks where Claire is and Jack tells her that she's still on the island. She objects, but is too weak. Hurley says that he can't find a first aid kit.

Jack asks Jin to hand him his bag that has a shirt he can use to apply pressure to the wound. As Jack is opening the bag, he says that he thinks the bullet went all the way through Kate. As he reaches his hand in the bag, he pulls out three blocks of C-4 (from the Ajira plane) attached to the digital watch that Locke took from the body of the Widmore's guy that he shot. The timer on the bomb is counting down from 3 minutes and 54 seconds. Jack says that they did exactly what Locke wanted.

This is an amazingly elaborate plan that Locke managed to pull off. He got everyone in one place with a bomb, just like Locke claimed Widmore was trying to do putting the explosives on the plane. This is the longest of cons that has played out over many years. The results are coming up.

Locke tells the group they must take the submarine, not the plane

As Frank leads the group through the jungle towards the Ajira plane, Kate asks Jack if he's coming with them now. Jacks says that he's not meant to go, but he'll help them leave. Sawyer thanks him for coming back for them.

Suddenly, Sayid emerges from the jungle, causing everyone to point their guns at him. Jack tells him it's okay because Sayid cut the power so they could escape the cages. Sayid says that they should go because Locke is waiting for them.

Later, after Locke has gone inside the plane, the group arrives at the Arija plane themselves. They notice the body of Widmore's guy with the broken neck when Locke emerges from the plane and says that he killed the two men. He says that Widmore placed the two men there for show and he knew that he would kill them because if Widmore wanted to keep him off the plane, he wouldn't have moved the sonic fence.

He then says that Widmore wanted to get them all in one enclosed place so they would all be killed with the four bricks of C-4 that were wired to the plane's electronics. He pulls the C-4 from his bag and tells the group that there could be more on the plane, so they'll have to take the submarine.

Hurley objects since Richard said that Locke was not supposed to leave the island. Sawyer says that Richard's opinion doesn't count since he's not there, then he thanks Locke for saving them twice and says that he was wrong about him.

Locke says that the submarine will be heavily defended, so they'll need everyone to succeed. Jack still doesn't want to leave the island, but says that he'll help them. Claire then apologizes to Locke, who says he understands why she left with the group.

Sawyer then hangs back to talk to Jack and starts to scheme again. He asks Jack to keep Locke from getting on the submarine by getting him in the water. It seems that Sawyer believes what Locke said about not being able to cross water earlier this season.

Locke finds C-4 on the Ajira plane, kills two of Widmore's men

After killing Seamus and presumably the other guys guarding the cages, Locke makes his way to the Arija airplane. He encounters two of Widmore's men guarding the plane who shoot at him, but he just keeps walking, unfazed. He snaps the first one's neck and then shoots the other one. He takes a digital watch from the wrist of the second which he uses later in the episode.

Locke makes his way to the plane's door, which has a stairway built out of bamboo and rope, presumably built by Widmore's people. He climbs inside and enters the cabin of the plane. He finds a wire running down the overhead compartment and follows where it leads to find an object he finds interesting, but we don't see here. We later learn that it was at least four blocks of C-4, which he takes.

Keamy dies activating the bomb, Jin gets left behind

Even though Locke tries to keep him from dying by trying to stop his neck from bleeding, Keamy dies anyway and his final words are "Wherever you go, Widmore, will find you." Ben's response is "Not if I find him first." When Keamy dies, the device on his arm is triggered which causes the light on the bomb to change from green to red.

On the freighter, as the light turns red, Michael continues to freeze the battery as the tank of liquid nitrogen runs out. He tells Desmond and Jin to leave, but Jin stays behind to help. Desmond arrives on the deck just in time to find the helicopter returning. He tries to warn them about the bomb, but the fuel is so low, Frank has no choice but to land. Back with the bomb, Jin studies the diagram of the explosives, but Michael tells him that he needs to go because he is a father now. Jin makes it to the deck just in time to see the helicopter taking off. Sun screams for Frank to turn around but he can't/doesn't. Yunjin Kim's acting in the scene is heartbreaking as her character is separated from her husband.

Michael uses liquid nitrogen to delay the explosion

Michael has a plan to use liquid nitrogen to freeze the battery so the c-4 cannot be detonated. Later in the episode, the tank begins to run low.

Back with the C-4, Desmond explains the BOOM

Back with the large amount of C-4, Desmond examines the set-up, stating that he had 6 months of explosive ordinance disposal in the military, which he says is just enough time to get yourself blown up. He explains that there's a trip wire (screen 5), dummy wiring (screen 6), multiple fire systems (screen 7) and battery (screen 8) and if any of these are disconnected or deactivated that there will be a BOOM.

It's an a elaborate setup. To read about the unpractical nature of this bomb, read Adam Savage from Mythbusters statement here.

Desmond discovers a large amount of C-4 on the freighter

Desmond seems to have found th source of the interference on the freighter. It's a large amount of C-4, most likely controlled by the device on Keamy's arm. The text on the C-4 says, "EXTREMELY HAZARDOUS AUTHORIZED MILITARY PERSONNEL ONLY." It's very similar to the explosives in Michael's case from Ben.

Will the explosives be activated and if so, by who?