I just got a Seiko SNA225 Daytona Chronograph(sorry, no photo). It's rated at 10Bar-(330 feet or 100m) water resistant. I actually do dive, and was wondering- this doesn't have a screw-down crown, so is it really good down to 330 feet? I won't go down below 130 feet, and rarely at that. Is this watch good for it, or is the rugged good looks just for show? Am I going to find out the hard way if this thing will survive the depths?