Yes, I have taken it underwater on 4 dives. The photo quality is excellent, but I ran into several issues on 2 of the 4 dives where the camera locked up with a 'Writing to card. Please wait...' message on the screen, which would not go away, even after restarting the camera. The only way i was able to restore functionality, was to remove and reinstall the battery, but that had to wait until I was above water. I documented this issue in the A7C forum. I'm confident the issue can be resolved or explained with some help from smart people