This is the dome in Hollywood, were the greatest show on TV takes place and the star of the show doesn't even know he's being televised.
Truman starts to suspect something is off, but he doesn't know what . Everything he has ever lived through has been staged/a lie, Including his fathers "death" was staged.
Truman tries to leave Seahaven with his wife. The producer has scared Truman of water since his dad drowned while boating with Truman. So to get over the big bridge that separates Seahaven to the end of the set, he closes his eyes and gets his wife to drive.
Truman, the next night digs a hole out of his house. In an act of desperation the producer puts the sun on in the dome to find Truman.
They find Truman with there cameras. He's on a boat trying to sail away to Figi. But they send him some bad weather and almost kill him.
Truman makes it through the storm and they stop sending storms at him. Truman then hits the edge of the set and walks up a stairway off the set.