The dive computer is not a witness that lies. It logged the descent into Lake Verity, the time at depth, and the ascent — fifteen minutes, start to finish. The diver remembers four. His partner on the surface, watching the bubbles, counted the same fifteen the computer did.
Where the missing eleven minutes went, and why the man who came up was in some hard-to-name way not the man who went down, is a question the file has never been able to close.
This file is cold. The full reporting, the dive logs, and the medical timeline go here.