Truly Sunken
Brainless and boring except for the last 30 seconds when cardboard cutout of diver is seen sucked into the blades of a powerboat propellar. Incredibly cheap production probably made as a drive-in second feature. I know, somebody will probably write a treatise on it in film school if they already haven't.
Let it be unsaid: insignificance is the locus of true increpation.