Pulau Layang-Layang, Malaysia has the deepest underwater mail box at a depth of 40 meters below sea level. Postcards sent from the underwater mailbox are sealed in waterproof plastic bags and have a special postmark.

Pulau Layang-Layang, Malaysia has the deepest underwater mail box at a depth of 40 meters below sea level. Postcards sent from the underwater mailbox are sealed in waterproof plastic bags and have a special postmark.

Image credit: Amusing Planet
Source: amusingplanet.com/201…