Jeden názor k tomuto:
What Patek did, and it is brilliant, is to attain the NEW ISO standard, vs. the older 30/50/100/200 ISO marks that made no sense. Patek, in line with the new ISO, states that the "30M" rating, actually means it is waterproof to the actual depth of 30M, including the normal activities one can do at that depth. Simple, clear, concise and all other brands should follow this.