Bah...nonsens...sorry to say that but that's just the same what every unexperienced watch noob on most of the watch fora says about watches and their waterproof rating. 1. There's no massive increase of pressure once you move your watch under water...at uhrforum.de there was one geek who tested it (theoratically as well as physical)...just nonsens. Pressure is slightly higher but only on the exposed parts what makes the watch even more waterproof. 2. These companies want to make money. The don't want you to use your up to 30m rated watch for swimming for example...better buy another watch which is rated 100m or above. So there are these DIN and lists and stuff that tell us that a 30m rated watch is good for washing your hands, 50m can be worn while taking a shower, 100m while swimming and only all above for diving. Back in my younger days I had lots of swatch. They all where rated 30m and I did everything with them...jumping from 10m, diving to 7m, swimming hours and hours...none of them ever got wet inside. My watchmaker today pressure tests most of my watches to 6atm, some to 10atm which means 60m or 100m in depth rate. None of these watches ever got wet inside! So when a Company sells a watch that is rated 200m waterproof you can do whatever you like (in- and underwater of course ) with that watch. If the watch is getting wet inside the QC was bad but not the crown system. And...you are covered by the guarantee... Sent from my wooden drums via Tupperware Uhhh...I got traped by a grave digger...that thread is 8 years old...quick...gimme a beer...need something to wipe away the odor of death... Sent from my wooden drums via Tupperware