In the past I've fined up from 3m to 1/2in of ice hitting it with the point of my knife. I just bounced off and couldn't break through. We were roped so could always get back to the entry point.
Sad loss.
Sad loss.
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Sorry, edited my previous post.That article was dated December 14. The incident this thread is about happened within the last few days.
If they were using cave protocol then nobody would have been tied off and there would not have been a line tender.
Ice diving means different things to different people.