This is a significant update of the game 'The Kaiyō Mission’ (under development). It now contains an additional mode for the third mission phase, where the player, a human diver, is equipped with an Underwater Transportation Device (UTD) that greatly enhances the speed of the diver, and therefore the range, given the limited oxygen supply.

The game enables the player to undertake three different mission phases, set on underwater plateaus of alien ocean worlds, including the Saturnian moon Enceladus and Jupiter’s moon Europa. In the first mission phase, the player has the mission to steer a solar-power-driven, robotic submarine on Enceladus, and to identify and take pictures of underwater features, plants, and animals. The second mission phase is undertaken starting from Earth, with human deep-sea explorers, extending the previous mission phase based on the areas and species already explored on Enceladus and beyond. The third mission phase takes the player to a plateau on Europa…