Don't Starve Together

Don't Starve Together

Tropical Experience | SW HAM Biomes : From Beyond
Question about underwater part
Ihave an issue - i can not go down in the underwater part. When i am clicking on the underwater portal, the character says only "it's a thing". I enabled an underwater part in the mod options. I am not sure what to do next and how to get inside. Can someone please help me with advice?