From Tom Groves
You told the tale of research during the second world war on ships made of ice under the guise of Project Habbakuk (22/29 December 2012, p 63). I suspect it was a cover for wider work.
When at the National Physical Laboratory in the late 1960s, a colleague showed me a film labelled Project Habbakuk. It showed a test of something which was definitely not an iceberg ship. In fact, it resembled a semi-submersible rig, with a deck above wave height on very stout columns supported by a pair of submerged pontoons. What other ideas might Habbakuk have included?
Kennington, Kent, UK
