An unfortunate thing happened in the testing of a prototype of Omega's new Ultra Deep diver's watch. Due to an equipment malfunction, one of the three FOD-X watches ("full ocean depth experimental") was left at the bottom of the Mariana Trench, some 10,928 meters down, the deepest point on the planet, for two and a half days.
The entire mission time for the planned dive and the extreme pressure test in 2019 was supposed to be 12 hours, with only a portion of that period spent at the bottom of the trench. No one intended for the watch to spend more than two days at such depths, where the pressure is 16,000 pounds per square inch—conditions that would incidentally do very nasty things to your body.
That 2019 concept watch was called the Seamaster Planet Ocean Ultra Deep Professional, and impressively, it emerged from its unplanned seabed ordeal not only unscathed but having lost only one second of time during the whole misadventure.
Now, nearly three years later, Omega has managed to take this extreme concept dive watch and manufacture a production version, called simply the Ultra Deep, capable of withstanding depths up to 6,000 meters. While not having the same depth rating as the concept, it is good enough to get the watch to the start of the hadal zone, the deepest region of the ocean.