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Last September, three people visiting the Solfatara volcano crater in Pozzuoli, a popular tourist attraction near Naples, died when an 11-year-old boy wandered past a barrier and fell into a pit; his parents tried to rescue him.

But those hot gases hold an ominous story: Solfatara is part of the massive Phlegrean Fields, a threatening supervolcano experts agree could begin erupting anytime.

POZZUOLLI, Italy—Tragedy struck at the Solfatara volcano crater north of Naples a few weeks ago.

Part of determining just when Solfatara or another portion of Phlegrean Fields might erupt is understanding what is under the crust.

The boy, who reportedly entered a prohibited area at the Solfatara di Pozzuoli volcano Tuesday, is believed to have fainted after inhaling sulphuric fumes, the Guardian reports citing Italian media.