Cutthroats

From Wikipedia

Cutthroats is an interactive fiction computer game written by Michael Berlyn and Jerry Wolper and was published by Infocom in 1984. Like the majority of Infocom's games, it was released for most of the popular computer platforms of the time, such as the Apple II, DOS, Commodore 64 and several other platforms. It is Infocom's thirteenth game.

The game takes place in and around the fictional Hardscrabble Island. The player's character is a skilled diver scraping to make ends meet. As the player attempts to mount a perilous dive for sunken treasure, several characters offer their help. Some of them can be trusted and some can not. Failure to tell the difference between the two can result in an "untimely accident". Successfully making positive contact with the right characters is the only way the player can advance to the actual shipwrecks. Once the dive begins the player must locate and retrieve the treasure from that wreck to complete the game.