PCjr games (unresolved)

[she's long gone]

When I was a kid my parents got us a PCjr and a couple games. The one my brother and I liked best had you as a scuba diving treasure hunter who would swim through these overhead-scrolling seas with electric seaweed, sharks, treasure chests, etc. Also if you held the Enter key or something during boot-up there was this strange game that would come up where you could manuever a guy into a box. Does anybody know what I'm talking about?