National Submarine Day 2026

April 11, 2026 is commemorated by the United States submarine community as Submarine Day, the anniversary of April 11, 1900 when the American Government purchased its first commissioned submarine, the USS Holland.

We have placed a detailed description of this event on this page: National Submarine Day 2025. For further information please stop by there!

More dates:

• National Submarine Day on Apr 11, 2025
• National Submarine Day on Apr 11, 2026
• National Submarine Day on Apr 11, 2027