1.   He spun tales of strange creatures like the alleged ice worm, said to be an edible invertebrate that burrows tunnels in glaciers and ice fields.

2.   Passengers crane their necks as he takes them through the natural wonder, formed by centuries of roiling waters burrowing a tunnel through the rock.

3.   The prisoners had inadvertently burrowed the tunnel in the shape of a U and dug themselves back into captivity.

4.   At least five firefighters were injured by a collapsing wall late Monday while they were burrowing a tunnel through the rubble to reach survivors.