Tide Ascent is the 37th province (Stage 2 Province 19) of the Oceanic Future, accessible (along with Seagull Domain) after taking control of Scuba Bay to the southeast. taking over Tide Ascent makes the submarine to the next continent map of the Oceanic Future appear, but the submarine remains inaccessible until Tangled Fins is also under the player's control.
If previous sectors acquired by negotiation:
Things seem to have calmed down around here but we can't let our guard down.
If at least one sector taken by force:
I knew we shouldn't be careless!
We're onto you!