While one diver battles a hammerhead shark, another diver comes down with decompression sickness; there is a battle of wills between two captains; all three boats are hit by a powerful storm that erupts out of nowhere.
The oldest diver in the fleet starts to question his career choice; a captain and a mechanic comes to blows; one diver questions his captain's decision to abort a dive.
A crew has to deal with a diver who has suspected decompression sickness. A captain faces off against a moray eel.
A diver makes a shocking discovery whilst diving on a huge sunken wreck. The captain of a boat attempts to find a replacement for a diver he had to fire.
A captain gets bad news from home while far out at sea; a first mate is demoted for insubordination; a diver is in trouble when his mask and regulator malfunction; a diver is surrounded by sharks.
A diver's light goes out at night just as he's surrounded by sharks; a diver is pushed to the brink of exhaustion while filling in for a sick coworker; a superstitious crew member tries to improve a boat's performance. Also: A restaurant conducts a survey of spear- and line-caught fish.
A conflict between two divers tests a captain's mediation skills; three divers are threatened by aggressive sharks; a diver blacks out on the ocean floor; two captains argue over stolen property.
In the Season 1 finale, the approach of winter creates increasingly dangerous diving conditions as the boats take their last trips of the season. Meanwhile, a captain loses a diver in a cave on the ocean floor; and a crew deal with elusive fish, a mechanical breakdown and a fierce wind a long way from the shore.