Your undersea explorations lead you to the long-hidden city of Atlantis, ruled by the evil king Retep. You'll need all your wits about you to survive your encounter with this malevolent despot.
Notes
This was adventure #4 in the SoftSide Adventure Series (formerly SoftSide Adventure of the Month Club). It was published as a bonus on SoftSide CV and DV (the cassette and disk versions) with the instructions in SoftSide Selections, issue 41, vol. 6, no. 8, June 1983, p. 20-21 and encoded hints in SoftSide Selections, issue 42, vol. 6, no. 9, July 1983, p. 23.
"Retep" is "Peter" in reverse. This is a reference to the author. It is interesting that he considered himself as the wicked prince!