Let me tell you about this and relieve some of your concerns!
Last year I took my Olympus TG-2 (TG-3s weren't out yet) to Cozumel without a housing. I was using it on the shallower dives to no more than 50' and was getting great photos. When not using the camera, I stuff it under the sleeve of my 3mm shorty. I guess I forgot that the next dive was to 80' or so and down we went. I started taking photos and the camera started giving me alerts that I was exceeding the maximum depth, but by then it was too late. I continued to take photos for the rest of the dive as the camera was functioning perfectly. When I got back on the boat I was still able to view the photos in the view finder. I examined the waterproof seals and nothing seemed wet so I continued diving with it.
Later that night at the hotel, the camera finally crapped out as I suppose some salt water seeped into a critical area. The SD card was fine and the photos turned out great. I got home, boxed up the camera and sent it to the Olympus repair center that literally said, "I flooded this damn thing, can you fix it?" Less than 7-days later they sent me a brand new camera.
I don't know if this answered your question but, I just felt like telling this story. I love Olympus.