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After all the Submarine Parts are collected, the player must return to the Sonar Collections Dock and talk to Abigail to complete the mission. Abigail will thank Michael for his help and start getting a little nervous when Michael asks some questions about a possible sabotage that caused the death of her husband. She will give $10 and a autographed photo of her ex-lover to Michael for his hard work before leaving. After the cutscene ends, the player will have the choice to either kill her or let her go. The player's decision will have no consequences to the game.
- Bring the submarine parts back to Abigail.
- Kill or spare Abigail's life.
- Abigail's car is an Asea, one of the rarest cars in the game, if the player wants to get it then he needs to wait until Abigail gets in the car and then kill her by shooting through the window or he can wait at the car and aim at Abigail, scaring her off. The car will be unlocked and the player will be able to take it to a garage.
The mission "What Lies Beneath" starts at 26:31