Submarine Day observed annually on March 17th and annually on April 11th.
When is Submarine Day?
- Submarine Day 2017 is observed on Tuesday, April 16, 2017
- Submarine Day 2018 is observed on Wednesday, April 11, 2018
- Submarine Day 2019 is observed on Thursday, April 14, 2019
- Submarine Day 2020 is observed on Saturday, April 12, 2020
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