Aquanauts Holiday - Hidden Memories
The actual story mode of the game can be compared to an adventure game. The main - unnamed - character is a journalist, in search of the missing oceanographer William "Bill" Graber. Using a submarine called the Dolphin no.2 you explore the seas for clues.
The game takes place in Kisira Atoll, in Polynesia. An oceanographic research facility named Kisira Base is the starting point and where you always come back to, for supplies (such as batteries for sonar navigation buoys) and equipment.