When you dig a tunnel in the Great Lake in search of someone or something, roll +Hard.
If you succeed, you get where or who you wanted. On a 7-9, choose a member of your group who you lost to the ice. If you fail, choose two who have succumbed, and also, you've run into a threat that stopped your progress.
Rossi, please make the roll above. Lemma, you're able to help Rossi, if you choose.