Just read this on Scuba Board:

The diver was diving solo and not certified for that. He had an AL 80 and his computer, which is locked out for 48 hours, show a max depth of 167 feet. The information that they were able to get off the computer so far is that his ascent rate from 167 feet to the surface was .....
33 seconds. His tank was empty and his bc was full due to normal expansion.