this happen to me. i was just careless. >> looking back at the entire odd mishap, matt is grateful for one thing. >> i like diving without a wet suit because it makes me feel more streamlined in the water. one of my concerns after the accident, i wasn't wearing a wet suit and i was only wearing a pair of board shorts and i was concerned that it could have been a lot worse if she had swum up under the legs of my shorts. >> now that would hurt. >> coming up -- >> it's actually stuck to my mask, and my mask was coming off. >> a giant pacific octopus tries to crush a diver. >> i thought it was coming straight through him. >> a 600-pound marlin spears a young fisherman. >> oh, my, god. oh, my god. >> all of a sudden this great white shark about four meters came and grabbed me. >> a surfer battles two great whites when "caught on camera: into the deep" continues. the world is filled with air. but for people with copd,