CSI: NY: Season 4, Episode 2 - ProjectFreeTV

4 - 2: The Deep

A sailboat race to Staten Island takes an unexpected tack when one of the boats nearly collides with a dead scuba diving instructor. Autopsy reveals this was no accident and trace evidence leads the CSIs underwater to an artificial reef made of discarded subway cars stacked up at the bottom of the Hudson where they find the dead diving partner of the first victim.