Ep 1. Deep Down

Angel season 4 episode 1, "Deep Down," begins with Angel in a deep, introspective state as he reflects on his choices and actions that led to him being trapped at the bottom of the ocean. He's been there for months, and the viewer sees him grappling with his own demons as he tries to find a way out.

The episode then cuts back in time to show how Angel ended up in this situation. After losing his soul again at the end of season 3, he went on a rampage and killed a demon who was actually being used as a conduit by a group of lawyers known as Wolfram & Hart. The lawyers, who had been watching Angel for some time, swooped in and captured him, draining him of blood and keeping him in a metal coffin that's now at the bottom of the ocean.

Back in the present, Cordelia, Wesley, and Gunn are struggling to keep the business running without Angel and are starting to get worried. Cordelia has a vision that leads them to believe Angel is still alive, and they set out to find him. However, their attempts are futile until they come across a demon who was also captured by Wolfram & Hart and who knows the secret location of the law firm's hidden submarine.

Once they find Angel, however, they realize that rescuing him won't be easy. He's been tortured and starved to the point where he's almost unrecognizable, and his psyche is shattered. He's convinced that he's still in the metal coffin and that everything he's experiencing is just a hallucination. The rest of the episode follows the characters as they try to bring Angel back to himself and out of his self-imposed prison.

Overall, "Deep Down" is a dark and intense episode that showcases the psychological toll that Angel's vampire abilities and his struggle to maintain his humanity can take on him. It also highlights the bond between Angel and his friends, who will stop at nothing to save him. The episode sets the tone for the rest of the season, which sees the gang dealing with the fallout of Angel's time underwater and his continued battle against Wolfram & Hart.