Quick answer

Unsinkable Sam is said to have survived the sinking of three ships during World War II: the German battleship Bismarck , the British destroyer HMS Cossack , and the British aircraft carrier HMS Ark Royal.

The story in brief

According to the most common version of the tale:

  • Sam started out as an unnamed ship’s cat aboard the Bismarck when it was sunk by the Royal Navy in May 1941.
  • He was rescued by sailors from HMS Cossack , who adopted him and called him “Oscar.” Later that year, Cossack was torpedoed and badly damaged; Sam again survived and was picked up clinging to wreckage.
  • He was then transferred to HMS Ark Royal , which was torpedoed in November 1941 and sank; once more, Sam was found alive on floating debris and taken off by another ship’s crew.

After that third sinking, the story goes, he was retired from sea duty, eventually living in Gibraltar and then in a sailors’ home in Belfast until his death in 1955.

How many ships, exactly?

All mainstream retellings agree on the same number:

  • Three ships survived by the same cat:
    1. Bismarck (German battleship)
    2. HMS Cossack (British destroyer)
    3. HMS Ark Royal (British aircraft carrier)

That’s why he’s remembered specifically as the cat who “survived three sinking ships.”

Is the story fully verified?

Here’s where it gets a bit murky, and why you’ll see this framed as a legend as much as a hard fact:

  • Some historians and sources note gaps and inconsistencies , such as:
    • No clear contemporary record of a cat being officially listed aboard Bismarck or surviving its sinking.
* Photos that may show two different cats being conflated into one “Sam/Oscar” biography.
  • Still, the core narrative —a ship’s cat associated with those three vessels and surviving all three sinkings—is widely repeated in naval lore, museums, and popular history.

So if you’re answering the literal question: the legend says three ships. If you’re asking “how many can we prove with documents?”, the answer is: the story is famous, but not every detail is airtight.

TL;DR

  • Number of ships Unsinkable Sam supposedly survived: 3
  • Ships: Bismarck, HMS Cossack, HMS Ark Royal
  • Status of the story: Well-known naval legend with strong popular circulation, but some historical details are debated.

Information gathered from public forums or data available on the internet and portrayed here.