Will Frictional Games make more Sea/Air monsters?

[The Rock Worm]

I agree.

Underwater has to be one of my favourite settings.

Although, with FG being an indie company I don't know if they'd struggle pulling it off, especially with the HPL game engines. Maybe in the future though....

I think yes in the future they would. With the Kaernk they took the first step to water monsters. I hope to see more water creatures.