An event every year that begins at 00:00 on day 30 of July, repeating indefinitely
When: July 30
First occurrence: 2016
On July 30, 1932 Joseph L Belcher patented
the ‘Belcher breathing apparatus’ which was an early version
of the modern snorkel.
There were actually snorkels before.
The ancient Greeks had slurf like swimming aides.
Leonardo da Vinci had elaborate snorkel designs.
But this date finally one got patented.