Or, you might fall through and drown or freeze to death. Wouldn't take long at all. Ice did the Titanic in by the way. Little bitty bit of the iceberg sticks up above water. Lots more below.
Ice is tricky stuff.
As to mythology, the Sheils suggest looking into the Mysteries of Ullr and Skadi, as well as to those of Jotunheim and its inhabitants, and into Niflheim, to better understand Isa. They also point out that Thurisaz, Uruz, Sowilo, Raidho, and Jera can all be used, depending on the situation, to either get around problems caused by Isa or else take advantage of them. While I disagree with most of what he has to say about Isa, the translations of the three Rune Poems that have come down to us make the book well worth having. See you real soon for the rune Jera, then must hunker down and continue turning into a Librarian.