Why do submarines surface through Arctic ice?

Why do submarine forces publicise boats surfacing through the Arctic ice pack?

Because it demonstrates that the crew can navigate beneath the ice pack, described here as the supreme navigational skill of a submariner.

A submarine surfacing through the ice pack is more than a dramatic photograph. The event demonstrates that the crew can navigate beneath Arctic ice, described here as the supreme navigational skill of a submariner. Publicising the surfacing therefore signals the force's under-ice competence.