- underwater cave
- ice cave
Commonly used word.
Underwater caves are caves that are fully underwater or that need people to go underwater in order to enter. Also caves of which the entrance goes completely underwater at high tide. For caves of which the entrance lies half within water, it is only called 'twahs' when the first passage is descending.
Ice caves classify under this term as well because ice is related to water. In this case, the entire cave should exist of ice, or the ice must at least make up for the majority of the part that can be passed through.
No example sentences use this word.