Aquaventure is a rather strange game where a deep-sea diver blows up innocent fish with harpoons.
The game was in development during 1983, though it was never mentioned in any official press releases, memos, or internal part lists. A pirated version, renamed Sea Sentinel, was released by CCE in August 1983; an official release wouldn't come until over 20 years later.
Unused Text#
At 0xFE9 is a very short string:
looney
Just after it, at 0xFF6, is another short string:
hot
(Source: John Aycock)