I was looking around on the Seiko website today, and noticed this technical bulletin which might apply to some in our "turtle" crazy community.
Here are the watches.
Last summer Seiko recognized an error in their users manuals which indicated these models are appropriate for "saturation diving". They are NOT.
"In saturation diving, the divers live in a pressurized environment, which can be a saturation system on the surface, or an ambient pressure underwater habitat when not in the water. Transfer to and from the pressurised surface living quarters to the equivalent depth is done in a closed, pressurised diving bell. This may be maintained for up to several weeks, and they are decompressed to surface pressure only once, at the end of their tour of duty. By limiting the number of decompressions in this way, the risk of decompression sickness is significantly reduced, and the time spent decompressing is minimised.
It is a very specialized form of diving; of the 3,300 commercial divers employed in the United States in 2015, only 336 were saturation divers.
If you are one of these divers in the US or elsewhere, please don't use your Prospex watch in saturation diving.