Group of mutant-underwater-zombie-Nazi-soldiers terrorizes stranded tourists staying at a deserted motel on a small island. Cushing is the mad scientist intent on recreating the Nazi glory days with the seaweed-attired zombies. Odd B-grade, more or less standard horror flick somehow rises (slightly) above badness. Halpin''s name was erroneously listed as Halprin--even on the original movie poster!