Hello MajorBarka !
It is a climatisation. It adds or removes some heat to try to reach 20°C.
How deep have you manage to dive and come back ?
Yes ! Even if it is just a prototype every pieces can help to dive deeper. (Some players managed to dive a few hundred kms and come back !)
Basically, it is a game about "Heat transfer" and trying to move quick enough in and out of hot areas without burning.
Every blue blocks are just "passive".
- They have a "thermal conductivity" (called "Heat transfer" in game) : The higher, the more it will let heat go through.
- And a mass. The higher, the more heat they would need to increase or lower their temperature (sayed differently, the mass "stores" the heat)
And the heat always moves from the hotter to the colder blocks. Granted, hulls are not the most usefull block Hulls I have provided, but, they can be used to store some freshness, or be placed between the atmosphere and the cabin to slow heat propagation down.