Some of such craters are located deep in caves and others may be found in the open ocean. These geological structures are classed as miniature biomes.
Every few seconds, the craters erupt, throwing steam and chunks of lava into the water surrounding it. They can only be observed from a safe distance, as their eruptions will cause massive damage to the Player. Even approaching the area near the geyser hurts the player due to the extreme amount of heat. However, the Prawn Suit can be used to protect the player from dangerous temperatures, enabling them to explore and collect resources near the Lava Geysers such as harvesting nodes or cooked edible fish.
It is sometimes a good idea to risk a short trip to the higher parts of such a structure located in the Safe Shallows, even at the beginning of a playthrough. It is greatly rewarding, yielding both Limestone and Sandstone outcrop resources. One can even find geysers really close to spawn, less than 600 meters away.
Seabases will not protect the player from eruption damage. Any wandering fish in the area that die of the eruptions or that come into contact with the lava will turn into their respective cooked forms, assuming that they have one.
Lava Geysers can be found in following biomes:
And may reward such resources: