Starbound: Sudden extreme cold at low depths?

Starbound: Sudden extreme cold at low depths? - Unrecognizable diver swimming under frozen water of sea

I was mining, and there was a point where if I go down a few blocks, I start losing heat rapidly: Rapidly losing heat underground! But if I go back up to the platform directly above it, my heat starts regaining rapidly. Rapidly regaining heat. What's going on? And does it have to do with that blue and gold thing next to the thermometer in the first screenshot?






Pictures about "Starbound: Sudden extreme cold at low depths?"

Starbound: Sudden extreme cold at low depths? - Anonymous diver in mask and wetsuit touching solid ice while swimming under seawater during freediving
Starbound: Sudden extreme cold at low depths? - Snowy mountains peaks and blue sky
Starbound: Sudden extreme cold at low depths? - Unrecognizable travelers with backpacks walking on snowy mountain slope





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Images: Svetlana Obysova, Svetlana Obysova, ROMAN ODINTSOV, Kunzang Dorjey