Two other Titanic ships were built and had tragic endings as well
From the Command Historian: The Risks of Neutrality in a Dangerous
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Researchers Discover A 100-Year-Old German U-Boat Wreck In
A German U-Boat in Newport Harbor During World War I - Online
RMS Olympic: The Early Years
The Photographic History of RMS Olympic (Titanic's Sister Ship
HMHS Britannic: Titanic's Bigger Sister - Abandoned Spaces
The Titanic's Sister Ship Took Out a German U-boat in World War I
Nazi U-Boats: Rattlesnakes of the Deep - Warfare History Network
Mystery shrouds the Lusitania's tragic sinking, 100 years on
Ship That Warned Titanic of Iceberg Discovered at the Bottom of
Wreck of the Titanic's 'sister ship' the Britannic to divers for
How OceanGate sub is the latest victim of the Titanic
The Sinking Of The Lusitania: Cover-Up, Conspiracy, Or Carelessness?