REPORTED STORY:
My equipment received annual service prior to our trip to Bonaire. After a morning shore dive with no issues, my husband and I went for an afternoon boat dive. We were the only passengers along with the divemaster and captain on board. I was using air, and the tank pressure prior to the dive was 3,000 psi. During the descent, at about 50 fsw (15 msw), I noticed that my high pressure hose had developed a hairline crack along the length of it. On the hose, approximately a two-foot long section had a thin fissure allowing a vertical pattern or "wall" of air bubbles to stream out of the hose.The divemaster came over to assist immediately. No assistance was needed, really. I relied on my training, did not panic – although I did curse into my regulator. I signaled the divemaster and my husband that they should go ahead with the dive and I would go back up to the boat.
I ascended slowly to the boat ladder, breathing normally through my regulator in spite of the torrent of bubbles coming from the split hose. When I got back onboard, my tank still had about 1,500 psi of air remaining. On the surface, the hose appeared to be intact. Upon closer inspection, however, I could see a very thin "line" along the section where air was escaping. Before I turned off the air, that section of hose hissed and I could feel the air escaping.

I realize this isn't a huge incident as diving problems go, but it was a first for me. I was pleased to note that I didn't panic, that I realized immediately I could ascend safely, and did so. I was able to get the hose replaced the same afternoon and no had no further issues the rest of the week.
~edited by Jeanette Moore