Impirically, all surface intervals are controlled deco, so yea. Mandatory decompression is a common theme to about 90% of my dives now. With that in mind, I'll need to wait for a housing that operates in the 350'+ range. Most external controls are spring operated and at those depths, ALL buttons are depressed which wrecks havoc with everything. I've abused depth limits on quite a few things that didn't cost much, but a $400 camera deserves the best fighting chance I can give it.