the Autavia with decompression diver bezel is strange, the "standard" bezels we all know are mostly logical. The decompression bezel was unknown for me. I am not a diver but i knew about the Caisson disease, when a divers goes to depths the waterpressure increases, this affects larger quantities of nitrogen (N2) in the blood. The deeper you go, the more nitrogen. When the diver goes up too fast, the nitrogen can't get out of the body and starts to bubble. We all can imagine that this is no fun.

The decompression bezel can tell the maximum time you can go at the depth in meters without the need for decompression.

If you go for instance 40 meters deep, you must go up in 15 minutes.

This scale was came from the net.

Here you can see the depth in feet and corresponding times.

juko