Titanic, Britannic, and Olympic's lenghts and widths were all EXACTLY the same. However, each ship was larger than its older sister because of it's weight. After Titanic sank, both Olympic and Britannic were outfitted with extended bulkheads (not all, just some), enough lifeboats for all and then some, and Britannic had the double hull bottom extended up the sides of the liner. As it's well known, the A deck Promenade was completely open until the early twenties, when it was then enclosed. Other differences were the arrangement of portholes along the C and D decks, Oly's dining room was not carpeted, where as Titanic's was. The theory that Titanic and Oly were swapped in an attempted insurance scam just doesn't hold water. No proof of this has ever been found, only suggestive theories of how it was done. As stated before, all hull numbers matched both ships. And for the record, the Olympic was scrapped in 1935 in Inverkeithing, Scotland, and there are pictures of her being towed and then being scrapped. Britannic sank in November of 1916 after striking a mine off the island of Kea. Ironically, with all the improvements made after her sisters disasterous maiden voyage, Brit sank in 55 minutes, where as it took Titanic 2 and a half hours to go down. I'm not saying it wasn't possible that the ships could have been swapped, but when you have a ship on the ocean floor bearing all the trademarks and namesakes of Titanic, and the interior workings of a ship named Olympic in a museum, and no solid proof of this scam, it just doesnt hold water.