Europa is a Star Trek planet that is alive (the discovery of life elsewhere)

They look more like tobaggan tracks in the snow than
tunnels. The double or multiple lines are where the
ice broke and refroze. Source of heat is from tidal
flexing, which looks to me what also breaks the ice.

That is what it is, look at ice on a puddle you get these cracks where the
ice has moved and cracked. On europa the cracks have organic stuff around
them indicating organic sludge below and since the ice is moving a water
ocean is below and that is "probably" teeming with critters fe by undersea
fumeroles from voltanoes as on earth on the ocean floor.