Grotta Piacenti

A 70 m hypogenic cave with a horizontal/vertical trend, opening inside a house in Cesi and featuring strong air flows.

Terni 70m 18m

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Grotta Piacenti

A 70 m hypogenic cave with a horizontal/vertical trend, opening inside a house in Cesi and featuring strong air flows.

Terni

Length: 70 m · Depth: 18 m

Updated record

https://espeleoworld.com/en/c/grotta-piacenti-terni-terni

Information can change. Always verify coordinates, access, weather, and cave conditions before setting out.

A 70 m hypogenic cave with a horizontal/vertical trend, opening inside a house in Cesi and featuring strong air flows.

Characteristics

Type: Cave
Municipality: Terni
Cadastre no.: UM77
Length: 70 meters
Depth: 18 meters
Record updated: November 12, 2026

Location

Route: 85 m, 3 minutes. Once in the built-up area of Cesi, from the small square by the pharmacy head EAST, following the SP22 downhill; after about 400 km park on the right in the small spaces between the low walls near a white house set above road level. Take the small pedestrian strip along the side of the house until you reach it; the cave is in the bathroom of the house and is entered through a window in the wall.

Entrance: entered through a window at the side of the bathroom wall; the cave was obstructed but two hours of digging cleared the entrance.

Entrance setting: urban, man-made, building.

Access: fence, private property; the cave opens inside the house of Mr. Pappalardo just outside the built-up area of Cesi.

Locality: Cesi, Gallarana, Gli Stalletti.

Entrances

Always verify coordinates and access conditions before setting out.

Grotta Piacenti
Elevation: 415 m
42.607300, 12.589010
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Description

Morphology

A series of galleries 70 m in development. From the entrance it continues along an inclined meander until reaching a large fissure that climbs partially. Lower down the cave bifurcates. Trend: horizontal/vertical. Traversability: experts only; recommended period all year round.

Geology: MAS Limestone Massiccio - Lower-Upper Jurassic (Sinemurian-Pliensbachian); massive limestones; massive; hypogenic cavity. It has many replacement pockets and hypogenic morphologies.

Speleothems

Presence of typical cauliflower speleothems indicating strong air circulation.

Hydrology

The cavity is hypogenic and blows a lot of air; it blows when it is hot, it always blows. Internal temperature 13.6 °C. Air flows: flow 0.9 mc/s (0.4*0.4 * 8.1 m/s * 0.7 coeff), about 50 mc/min. All the air of the cave reaches a small chamber at the bottom right that can be dug; measurements of 04/08/2024.

History

Notes on the name: it takes its name from the owner of the house at the time of its discovery.

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Bibliography

LEMMI G. & COLETTI G. (1961) Elenco catastale delle grotte dell'Umbria ANONIMO (1962) Attività del Gruppo Grotte dell'Istituto di Geologia dell'Università di Perugia MATTIOLI B. (1970) Considerazioni genetiche su alcuni depositi di Mondmilch dell'Italia centrale

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Source: Catasto Cavità Umbria (Federazione Umbra Gruppi Speleologici, FUGS) (catasto.fugs.it), modified. LicenseRef-FUGS-no-licence-stated Federazione Umbra Gruppi Speleologici (FUGS), Catasto Speleologico dell'Umbria · https://catasto.fugs.it/index.php?mod=caves&op=view&id=77 · data as of 2025 · Source: Catasto Cavità Umbria (Federazione Umbra Gruppi Speleologici, FUGS) (catasto.fugs.it), modified. LicenseRef-FUGS-media-per-item Federazione Umbra Gruppi Speleologici (FUGS), Catasto Speleologico dell'Umbria · data as of 2025