Worm-like animals native to the frozen moon Andoria that produce intense heat through a chemical reaction, melting tunnels through the ice in which the Andorians and Aenar live.
Ice bores are small burrowing creatures of Andoria. Their bodies give off enough heat, by a chemical reaction, to melt the ice around them, so that colonies of them leave winding tunnels and weakened patches behind. Touching one causes a serious burn.
They appear in the Enterprise episode The Aenar in 2154. As Jonathan Archer and Shran descend through the ice caverns of the Northern Wastes in search of the reclusive Aenar, Shran points out the bores glowing in the ice and explains what they are, recalling a childhood encounter with them.
Soon afterwards the ice gives way beneath Shran and he is badly hurt in the fall, his leg run through by a spike of ice. He and Archer are found by the Aenar, who treat the wound.