Project Habbakuk and Pykrete (1943)
British inventor Geoffrey Pyke proposed building aircraft carriers from reinforced ice, a mix of ice and wood pulp he called pykrete after himself. Engineers built a 1,000-ton prototype on Lake Patricia in Alberta, Canada, and the British war cabinet funded experiments.
The prototype worked, but the project was cancelled as the war's needs shifted and costs ballooned.
Pykrete became a famous curiosity, and reinforcing ice with fibers stayed a niche idea for decades.
BioPykrete takes the same ice-plus-fiber concept and adds cellulose nanocrystals plus a protein glue that binds them to ice, addressing the brittleness that limited pykrete.
