Idle Submarine is an adventure idle - game. Start commanding of Submarine, join the international round-the-world race and become the best captain. The race will not be an easy walk, the opponents are strong, and to become the first, upgrade the boat on the move: engine, production system, jet section, cargo hold. Collect unexplored resources at the bottom, complete quests for Mr. Dave Johnson, explore caves and design your unique Submarine. Seal the hatch and let's go!