There is much. There are already efforts being put together to take care of the flooding below.

Vineacondas, gummelon, and the foot to three foot long eels would help me make the sealant to make the floor below water tight. Sacrifices to Dellen would not be a bad idea.

Any sort of water manipulation.

Yukari is organizing the efforts.

....also anything to make S'vx weaker. Killing snakes would be the easiest.