I really like these apart from being (in my eyes) rather overpriced, according to the website orange bar on rehaut controlling crown disappears when you screw in the crown to ensure you are not going to forget screwing in the crown (that reminds of older Master Compressor crown system) for calculating decompression stops, considering you calculate decompression stops on the go you would have to unscrew the crown underwater to set the appropriate decompression time based on you calculations, bezel that you cannot operate underwater is rather useless from divers point of view (not like anyone dives with these kind of watches).