Pozzo del Merro (lake)
The small lake at the bottom of the Pozzo del Merro doline, the only entrance to a flooded shaft explored by research divers to 100 m and by ROV to 392 m. Access requires permission from the landholder ACEA.
The lake is reached from the south-eastern, lowest point of the doline rim by old masonry steps, a ledge path and finally an iron ladder. Its surface is covered with small floating green plants.
Below the water the shaft drops steeply with side chambers at about 30 and 60 m and a sizeable meander at 160 m. The cave sheet estimates that between 50 and 100 research dives were made from 1998 to 2002, leaving lines and guide ropes in place in the flooded shaft.
环境
A steep, smooth-walled flooded shaft with clay deposits and a ledge near 70 m that only a diver or a free-swimming robot can pass; debris that has fallen from above lies in the conduit.
仅供方位参考，不可用于导航。空心圆点为大致位置。
本页所有信息及其来源 (8)
| 信息条目 | 状态 | 来源 |
|---|---|---|
| The floor of the flooded shaft lies 392 m below the lake surface. | 已核实 | [1] [2] |
| Between 1998 and 2002 an estimated 50 to 100 research dives were made, and lines and ropes were left in the shaft. | 已核实 | [1] |
| A ledge at about 70 m depth can only be passed by a diver or a robot able to move freely in the water. | 已核实 | [2] |
| Water temperature is about 15-16 °C all year. | 已核实 | [2] |
| The cave is on fenced land and permission must be requested from ACEA, which manages the area.Sheet undated. | 已核实 | [1] |
| ACEA permission is required. | 已核实 | [1] |
| Area-level position derived from the register coordinates 42°02'19" N, 12°40'50" E. | 已核实 | [1] |
| Area-level position derived from the register coordinates. | 已核实 | [1] |
已核实：来自我们直接查阅的官方或主要来源。已报告：仅来自二手来源。来源存在冲突：注释中列出两种版本。可能已过时：我们找到的最新来源已有一定年代。
由我们根据上述来源以自己的文字整理撰写。 提交更正