Siren II, a submarine under the command of Capt. Phillips, ventures into the deep on a mission to recover the missing Siren I. Their quest is hindered when the submarine becomes entangled in a patch of toxic seaweed.

An experimental submarine, the "Siren II", is sent to find out what happened to the "Siren I", which has mysteriously disappeared in a submarine rift. Things go awry when they begin to find things that shouldn't be there.—Luis Carvacho <[email protected]>