Paw broon's mention of SEA HUNT really made me think that there exists an entire small subgenre of SCUBA-diver comics. A similar TV series, THE AQUANAUTS, was featured in Dell Four Color 1197, and also the kids' show DIVER DAN in Dell Four Color 1254. DC of course had SEA DEVILS, Tower Comics had UNDERSEA AGENT, Hillman had FROGMAN Comics, Dell had THE FROGMEN, and Avon had FIGHTING UNDERSEA COMMANDOS.
The latter underwater war setting leads us into the related subgenre of submariner (not to be confused with Sub-Mariner) comics... ACG had COMMANDER BATTLE AND THE ATOMIC SUB, Gold Key/Western had VOYAGE TO THE BOTTOM OF THE SEA based on Irwin Allen's TV show (preceded by an issue adapting the movie starring Walter Pidgeon), while Dell (by now split with Western) countered with its own short-lived VOYAGE TO THE DEEP (with some nice Sam Glanzman art, these were recently reprinted in an IDW hardcover collection) -- which Gold Key counterattacked by launching CAPTAIN VENTURE AND THE LAND BENEATH THE SEA. Charlton had the amazingly long-running (44 issues) SUBMARINE ATTACK.