Cancer radiation treatment has destroyed over half of my formal lung capacity and i find i am no longer able to do the snorkeling that i have enjoyed in the past. i am wondering if there is some sort of assisted breathing device that i could use use to casually snorkel along the waters here in florida. i am content to mainly stay on the surface and maybe take a deep breath to go down 5 or 6 feet once in a while - i am 61 and not interested in testing myself or push any limits but i am quite disapointed that i cant paddle along at look at the part of the world i like so much.... thanks