THE DOG'S CAVE
The Grotta del Cane is a short, 9m deep, artificial gallery located on the rim or the basin of Agnano near Naples. The basin is in reality the remains of an 8.000-4.000 year old collapsed volcano, just one smaller caldera of the Phlegraean Fields.
Naturalists from Antiquity until the Renaissance know of the strange phenomenon and speculated about toxic vapors coming from the underground, killing smaller animals.
The gas emanates from the volcanic underground and accumulates in the dog´s cave. At the entrance the layer of carbon-dioxide is just sufficiently thick to suffocate smaller animals, deeper in the cave it can become dangerous also for humans.
Naturalists from Antiquity until the Renaissance know of the strange phenomenon and speculated about toxic vapors coming from the underground, killing smaller animals.
The gas emanates from the volcanic underground and accumulates in the dog´s cave. At the entrance the layer of carbon-dioxide is just sufficiently thick to suffocate smaller animals, deeper in the cave it can become dangerous also for humans.
http://historyofgeology.fieldofscience.com/2016/08/the-dogs-cave-and-unseen-killer.html
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