You can find the Cave of the Abyss Exploration at your Territory’s Gate and via the Tides of War feature. 

Stamina is required to participate. 

Fleets can be formed from your Territory. Cave of the Abyss Exploration Stages can then be cleared for rewards without having to Set Sail.

※ Ships and Pirates will not be damaged when participating in Cave of the Abyss Exploration.

※ The Exploration rewards are based on the highest level Stage cleared. Prizes will accumulate for up to 8 hours.