Xperia Z1 Case that covers all rubber flap, any ideas? topic

Hello everyone :)

I had an idea about using my phone under water to take pics and videos etc. I'm a little paranoid about the flaps coming open though.

I was wondering if anyone had come across a case that covers all of the flaps but still gives access to the shutter button?

Also if not, have you guys got any ideas as to ways of guaranteeing that they stay closed?

I know it's a bit of an odd request! Lol

Thanks in advance for any help!

Will :)