In 1975, after seven years of development, Seiko introduced a dive watch that would change the category forever.

Welcome to Watches You Should Know, a biweekly column highlighting important or little-known watches with interesting backstories and unexpected influence. This week: the Seiko “Tuna.”

The work of an offshore commercial diver is about as different from recreational scuba diving as flying a fighter jet is from flying a kite — eight-hour shifts on the ocean floor, 600 feet down, welding pipe followed by days living inside a pressurized habitat breathing a helium gas mixture that makes macho divers sound like Alvin and the Chipmunks. This lifestyle takes its toll on the human body, but it also has an effect on their equipment, including their wristwatches.
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