900 miles of ice. hmm
first issue, make a bigger hole nearby.
cover a large area with some kind of fuel and light it. area should be at least 100x100. if that works... consider making another patch 1/4 mile away ... and find a way to draw attention to it... like a submerged line of glowing bulbs or a sound. draw the orcas to the new hole. repeat.
That is exactly the idea I had except I was thinking they could melt several large holes nearby so there is room enough for all of them to breath until an ice breaker can be brought in.
“..consider making another patch 1/4 mile away..”
Sounds like a perfect excuse to get rid of some old ordinance on a bomb training mission. Bombs away!
I’ll bet Disney is working on the movie as we speak.