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Taking a $15 Casio F91W 5km underwater

Brands like Rolex and Omega will often tout their deepsea capabilities with the Rolex Deepsea Challenge rated to 11,000 meters (36,090 feet) and the Omega Ultra Deep coming in at a lesser but still ridiculous 6,000 meters (20,000 feet) of theoretical water resistance. But what about a cheap Casio often associated with terrorists and hipsters? With around $15 and some engineering know-how, can an affordable watch also venture into the deep ocean?

Photo Credit: US Navy Like many whose lives revolve around the sea, Josh is a watch guy, and when he asked if I would be interested in seeing a Casio F91W dive deep on the manipulator arm of an ROV or remotely operated vehicle, I answered with an enthusiastic “hell yeah”. By the 1970s, American submarine espionage was in full swing, with the specially modified USS Halibut using diver lockout chambers and saturation diving methodology developed during SEALAB to attach listening equipment to Soviet communication cables in the Sea of Okhotsk as part of Operation Ivy Bells. In addition to its nuclear submarines and a much improved undersea listening system that detected the implosion of the Titan submersible in 2023, the US Navy quietly maintains its Marine Mammal Program, (allegedly) primarily for Mine Countermeasures (MCM), but other recent clandestine acts on the sea floor have—once discovered—burst into the headlines.

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