In this 2009 thriller directed by Fred Olen Ray, a decommissioned submarine is repurposed for a secret mission, only to become a deadly trap when a scientist’s experiments with genetically altered snakes go awry. The film stars Luke Perry and Krista Allen, who find themselves battling both the serpentine menace and the claustrophobic confines of the submarine. As tensions rise and the stakes become life-threatening, the crew must find a way to survive the slithering threat. This intense narrative can be viewed for free on 123Movies / Movies123.