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The Oxygen Tank is used to explore the Ocean Floor through Underwater Diving. It can be crafted with 50 IronBars.png Iron Bars at 19 Crafting after unlocking the ability from the Tier 2 Fishing Research. An underwater dive will take three hours, and during this time you will not be able to catch fish from your fishing equipment.

After returning from the dive, you will receive various types of fish, in addition to other unique items including Fish Bones, Seaweed, Oysters, as well as items required for progression in the game, such as the Boat Blueprint (after unlocking the Fishing Tier 3 Research) to craft a Row Boat, and Blue Spice for The Stew Chef quest. In addition, you can also receive the Small, Medium, or Large Shell, which can be sold to the Museum.

Home2.png Buildings and Machines Rocket.png
TitaniumBars.png Tiered CommunityCenter5.png Community Center PromethiumOilWell.png Oil Wells TitaniumOilFactory.png Oil Factories OilStorage5.png Oil Storage
TitaniumFurnace.png Furnaces TitaniumCharcoalFoundry.png Foundry TitaniumOven.png Ovens
Home1.png Home Home1.png Cabin Home2.png Castle Home3.png Mansion Museum.png Museum
MiningSkill.png Mining Drills.png Drills Crushers.png Crushers GiantDrills.png Giant Drills Excavators.png Excavators Robot.png Robot Rocket.png Rocket
FarmingSkill.png Farming Planter.png Planter
FishingSkill.png Fishing OxygenTank.png Oxygen Tank RowBoat.png Row Boat CanoeBoat.png Canoe Boat