They actually started the planning and final R&D! (That is before they realized that a slowly-melting ship isn't the most stable or sustainable solution to sea-

They actually started the planning and final R&D! (That is before they realized that a slowly-melting ship isn't the most stable or sustainable solution to sea-travel and -defense.) https://en.wikipedia.org/wiki/Project_Habakkuk https://en.wikipedia.org/wiki/Project_Habakkuk