I am a rescue certified diver, and I've been landlocked since my treatment for stage 4 nasopharyngeal Carcinoma. I'm desperate to get back in the water. I haven't treid yet, but my best recommedation is to be cautious. If you have any trouble clearing your ears on descent, abort the dive. Never forget the possibility of a reverse squeeze. They are far more painful and dangerous when bottom and/or air are running low. My thoughts are with you. If you are successful, let me know! I'd give anything to be back in the water!