You picked a horrible example. Rolex Sea Dweller is amongst the thickest of dive watches because it's designed to be taken to extreme depths (depths no human will ever descend to in a diving suit).
Here's Piaget Altiplano for example: http://blog.luxurybazaar.com/wp-content/uploads/2014/02/Piag...
or
Blancpain Billeret https://s-media-cache-ak0.pinimg.com/236x/62/39/fa/6239fae47...