I’m watching Sea Hunters, Clive Cussler’s marine archaeology TV series, and they’re looking for the Habbakuk prototype built in a Canadian lake from an ice/wood pulp mix called pykrete. I’ve been fascinated by this project for a while, stealing the concept for the eponymous carrier in Heavensent.
Sea Hunters has a blog with behind the scenes pieces about the Habbakuk episode.
Habbakuk links via Beamjockey.
More Habbakuk information, and Wikipedia on Habbakuk. Habbakuk of Ice, a radio play about the project.