Cenotes Diving

[THX1138]

World's longest underwater cave discovered in Mexico: Divers reveal that two areas previously thought to be separate actually form one 216-mile-long connected maze of caverns

• The 216-mile long maze of caverns was discovered off the eastern coast of Mexico in the Yucatan Peninsula
• It had previously been thought that two large caves were separate and not connected together in any way
• But divers and scientists working in the region have now discovered that the two caverns are one large cave

Read more: World's longest underwater cave discovered in Mexico | Daily Mail Online
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[Lorenzoid]

Not in Cozumel, though.

Another thread here:

Largest flooded cave system in the world discovered at Tulum