Pozzo del Merro

Pozzo del Merro is a flooded sinkhole in the countryside northeast of Rome, Italy. Situated at the bottom of an 80 m conical pit, at 392 m (1,286 ft) it is the second deepest underwater vertical cave in the world. In 2000 two ROVs were sent to explore its depths; the first, the "Mercurio (Mercury)" reached its maximum operative depth of 210 m (690 ft) without reaching the bottom. The second ROV, "Hyball 300", reached 310 m (1,020 ft) without touching down either.[1] A third dive in 2002 with the more advanced "Prometeo" robot reached the bottom at 392 m (1,286 ft), but discovered a narrow passage continuing horizontally.[1]

Pozzo del Merro
Coordinates42.039298°N 12.680456°E / 42.039298; 12.680456
Depthc. 392 m

The sinkhole, similar to the Zacatón cenote, was formed by volcanic activity eroding the carbonate rock.[2]

References
  1. Ant, Simon. "MSTD - Caves and Wrecks technically explored !". web.infinito.it. Retrieved 2018-08-24.
  2. "VOLCANICALLY INFLUENCED SPELEOGENESIS: FORMING EL SISTEMA ZACATÓN, MEXICO AND POZZO MERRO, ITALY, THE DEEPEST PHREATIC SINKHOLES IN THE WORLD". gsa.confex.com. Retrieved 2018-08-24.

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