Oplontis
Recent archaeology has shown that it suffered unique type of destruction because of its proximity to the sea, different from Pompeii or Herculaneum. The volcanic eruption generated a pyroclastic flow that sped down the mountain toward Oplontis. The impact of the flow on the sea surface led to a type of "tsunami" which caused the violent entry and deposition of a water-heavy layer in the barrel-vaulted rooms (similar to the deposit that buried the skeletons on the shore of Herculaneum). The people sheltering at Oplontis died beneath a mixed mass of superheated gas, ash, and water. The impact of the wave probably also caused the collapse of the barrel-vaults.