Alternative titles: Run Silent, Run Deep, Run Around in Circles; It’s Not Just a Blob, It’s an Adventure
Starts briskly, maintains a crisp pace throughout.
Plenty of fun-but-cheesy model work and underwater effects.
Layers of mystery—shipwrecks, feuds, frogmen—are piled on.
Surprisingly little stock footage used.
Some attempt to introduce ideas about duty, peace, war and courage that fall outside the mainstream for most monster-mashes.