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Apr11 Fun Holiday – Submarine Day

March 17 is Submarine Day. The unofficial holiday celebrates the technological advances that make the use of the watercraft possible.

Honor people who build and work on submarines.


It is thought that the unofficial holiday commemorates the date in 1898 when Irish engineer John Philip Holland showed his submarine design to the U.S. Navy.

Modern Submarine

Called the Holland Type VI submarine, his prototype was the first modern submarine design to work successfully underwater. His submarines became the first vessels to be bought by the United States Navy and the British Royal Navy.

A similar holiday is celebrated on April 11 in the US as a way to honor the anniversary of the establishment of the U.S. Submarine Force in 1900.

Military Purposes

Submarines have primarily been used for offensive military purposes throughout the 20th century. During World War I and World War II, they were used to sink enemy ships. In the present day, while submarines are still used by the military, they are increasingly being put to use for civilian benefits. Their ability to go deep underwater have made it possible for scientists to research marine life and sea beds. They are also sometimes used for underwater tourism.

Most present-day military submarines run using nuclear power, though, in many parts of the world, diesel-electric submarines are also in common use.

Submarine the Sandwich

In many parts of the United States, a submarine is a type of sandwich. Usually made with a long roll of bread and filled with meats, vegetables, and spreads, this popular lunch dish is also called by other names like hero, hoagie, grinder, and sub. It is thought that the sandwich was named submarine because it resembles the shape of the underwater vessel.

How to Celebrate?

  • Learn more about the art and science of submarines.
  • Celebrate the day by consuming as many sub sandwiches as you can.
  • Watch movies that feature submarines.

Did You Know...

...that the first known submarine was created in 1620 by Cornelius Drebbel?

Submarine Day Observances

Fun Holiday: Submarine Day Observances
2024SunMar 17Submarine Day
2024ThuApr 11Submarine Day
2025MonMar 17Submarine Day
2025FriApr 11Submarine Day
2026TueMar 17Submarine Day
2026SatApr 11Submarine Day
2027WedMar 17Submarine Day
2027SunApr 11Submarine Day
2028FriMar 17Submarine Day
2028TueApr 11Submarine Day
2029SatMar 17Submarine Day
2029WedApr 11Submarine Day
2030SunMar 17Submarine Day
2030ThuApr 11Submarine Day
2031MonMar 17Submarine Day
2031FriApr 11Submarine Day
2032WedMar 17Submarine Day
2032SunApr 11Submarine Day
2033ThuMar 17Submarine Day
2033MonApr 11Submarine Day

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