Mike tente de libérer le pilote d'un avion abattu de son cockpit étanche avant que l'air ne s'épuise, sans provoquer la mort de l'homme à cause de la pression de l'eau.

Alors qu'il enquête sur les causes de l'inondation d'une mine qui a tué trente hommes, Mike tombe sur une poche d'air avec deux survivants.

La rancune entre deux plongeurs que Mike teste pour leurs compétences en matière d'exploitation minière sous-marine devient un problème secondaire lorsque l'un d'eux contracte une narcose à l'azote.

Avant que Mike puisse enquêter sur la disparition d'un couple de géologues plongeurs, l'un d'entre eux est retrouvé mort sur la plage, portant des marques ressemblant aux valves de succion d'une pieuvre géante.

Mike aide la patrouille frontalière du département de l'immigration à démanteler une opération de trafic de frontière sous-marine.

Une belle femme engage Mike pour lui donner des leçons de plongée pour des raisons mystérieuses.

Une séduisante photographe de magazine engage Mike pour l'aider à prendre des photos d'une péniche coulée au large des côtes du Mexique.

Hired to test a new electronic fish-finder, Mike encounters a village where every fish in the vicinity has disappeared.

A pair of ruthless treasure hunters dupes a young skin diver into helping them loot a sunken ship.

Mike dives into the Caribbean to recover the lost nose cone from an ICBM rocket before enemy agents can get it.

A killer whale is capsizing boats and endangering scuba divers and swimmers along a stretch of coastline.

Mike plays commando in rescuing a scientist who had defected from Soviet kidnappers who are returning him to Moscow aboard a Pacific liner.

Mike and two cameramen are imperiled when an irrationally jealous man drops their camera cage into shark-infested waters.

Mike competes with a pair of helmet divers to salvage a German submarine sunk off the coast of South America.

A man claims to have invented a machine that can locate ships carrying gold.

Mike is nearly killed by a massive electrical jolt used by a poacher to kill fish in the Florida Everglades.

Mike interrupts an underwater survey in the Gulf of Mexico in order to save a diver whose air line has become snarled.

Mike supervises a diamond diving expedition in South America, but discovers that his employers are poaching on someone else's property.

A vicious alligator escapes from a wild animal show and takes refuge in the lake of a public park.

An entire Mexican town is menaced by the presence of a derelict floating mine in its harbor that could ignite fumes from the local nitrate factory if it is detonated.

The State of Florida hires Mike to organize and train an underwater police force to deal with a series of underwater crimes.

Mike investigates an underwater grotto said to feature a mermaid that lures men to their deaths.

A professor and his daughter hire Mike to help them search for a rare underwater plant in Costa Rica.

A pair of prospectors hire Mike to trace the source of radioactive fish with a Geiger counter in hopes of finding a uranium deposit.

Mike is hired by a playboy sportsman to supervise their underwater shark ""safari"" in the waters off Peru.

Mike finds a famous rocket scientist being held in an underwater prison by enemy agents.

A frustrated former athlete pushes his children to be Olympic swimmers, resulting in their becoming trapped in a cave by a rising tide.

Mike leads a diving team in rescuing a Latin American diplomat and his family from kidnappers.

Mike and three other survivors share a life raft after a storm capsizes their boats.

Mike's work on a movie prompts a fellow stunt diver to attempt a dangerous record-setting dive.

After locating a leak in a gas line and retrieving a young boy's sunken bicycle, Mike is beaten up and threatened by a gang of thugs.

An underwater camera holds the key to determining whether a woman's drowning was accidental, as her husband claims, or not.

Mike is hired to destroy an underwater offshore peak that is notorious for ripping the hulls out of passing ships.

A group of sportsmen hire Mike to supervise their skin-diving outing, whereupon one of them sneaks off and begins photographing secret Navy facilities.

Mike is hired by an insurance company to investigate the sinking of a freighter, but a murder indicates that someone doesn't want him to complete his task.

Mike investigates reports of a sea monster off the coast of Mexico.

The murder of a telephone company employee leads Mike to an underwater cable that is being tapped to access top-secret research Conferences.

Mike discovers an important manganese deposit, but an ambitious young geologist, sharks, and an approaching hurricane threaten to silence him before he can inform the government.