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Guinness World Records
  Deepest Underwater Postbox
 
WHO:
Heinz Piorkowski
WHAT:
10 metres (32.8 ft.)
WHERE:
Wakayama-Ken, Japan
WHEN:
April 23, 1999

The world's deepest underwater postbox is located 10 metres (32.8 ft.) beneath the waters of Susami Bay, Japan.