Cardboard Ocean liner sinks, even with watertight compartments (experiment) - YouTube
1930 DIE-CUT 3D CARDBOARD ADVERTISING SIGN White Star Line BRITANNIC steamship | eBay
Not certain if this is 100% relevant, but I made a cardboard ocean liner. She has some interior, watertight bulkheads, and floats perfectly. She is the R.M.S. Kardboardistik. I'd love to hear
Texas Toy Distribution CP-102 2 mm Titanic Cardboard Puzzle - 1000 Piece, 1 - Pay Less Super Markets
How to Make a Model Ocean Liner from Cardboard - YouTube
Cardboard Cruise ship Holland America Lines (1950s) - Auction Pubblicità, giocattoli e Locandine cinematografiche - Casa d'aste La Rosa