National Submarine Day

Frequency:
Every
Apr 11
Hashtags:
References:
en.wikipedia.org/wiki/Submarine_Day
x.com/BORIA1778/status/1778470826108506130
nationaldaycalendar.com/national-submarine-day-april-11/

National Submarine Day occurs annually on the 11th of the month of April.

April 2025

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See Also(3):

Submarine DaySSN 722 DaySubmarine-Hoagie-Hero-Grinder Day