蓝洞
Sawmill Sink
A fossil-rich inland blue hole on Abaco with a toxic hydrogen sulfide layer and oxygen-free deep water. It is a research site: underwater activity is reported to need a special permit.
Sawmill Sink is a near-circular shaft about 15.5 m across in the pine forest of south-central Great Abaco. Below a fresh-water cap lies a cloudy, hydrogen sulfide-rich mixing layer that blocks daylight, and beneath that is salt water with no oxygen, which is why bones and plants on its rubble cone have survived for thousands of years.
The site is known through scientific diving rather than tourism. Fossil recovery there produced extinct tortoises, dozens of Cuban crocodiles, birds, bats and human remains, studied by a team of Bahamian and US researchers. Because of these finds, published accounts report that any underwater activity requires a special permit, and the sink is inside the South Abaco Blue Holes Conservation Area.
环境
Fresh water to about 9.5 m, a hydrogen sulfide-bearing halocline to about 27 m, and anoxic salt water below; a talus cone from about 9 m to 34 m; cave passage continuing south to 54 m.
环境条件
The hydrogen sulfide layer blocks light and is poisonous; National Geographic reported a bacterial layer colouring the water at roughly 9 to 11 m.
典型范围来自已发表资料，不代表当前实际状况。
本页所有信息及其来源 (7)
| 信息条目 | 状态 | 来源 |
|---|---|---|
| The opening is nearly circular and up to 15.5 m in diameter. | 已核实 | [1] |
| Fresh water extends to 9.5 m, a hydrogen sulfide-bearing halocline and mixed zone to 27 m, and anoxic salt water below; a talus cone lies from 9 to 34 m. | 已核实 | [1] |
| The cave associated with the sink extends more than 600 m south to depths of 54 m.As published in 2007. | 已核实 | [1] |
| Bacteria colour the water at about 30 to 36 ft (9 to 11 m), and poisonous hydrogen sulfide is present in that layer and the one below.2010 magazine account. | 已报告 | [3] |
| Any underwater activity at Sawmill Sink requires a special permit because of archaeological discoveries.2019 report; authority not named. | 已报告 | [2] |
| A special permit is required for any underwater activity.2019 report. | 已报告 | [2] |
| The sink is in the pinelands of south-central Great Abaco Island.Numeric coordinates withheld: permit-only research site. | 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。
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