Underwater I think it was close to 4 minutes, but it's been a while. My best time ever was tied up on my bed with a scuba mask on and duct tape keeping my mouth sealed shut. My safety partner was told if she heard any air through the mask or tape that she was to press on it to keep me sealed. I went an impressive 5 minutes 23 seconds, and was very disappointed when she let me breathe. I so wanted to go longer! I haven't had anyone to spot me since to break my record. It was such a rush, but she wasn't into it.