केव सिस्टम
Boesmansgat
Depth reached by Nuno Gomes on 1996-08-23 as published on his own site; the Mail & Guardian reported 283.3 m in 1996 and a 2002 GUE report quotes 286 m. Treat the bottom depth as about 282-286 m depending on source and water level.
A very deep flooded dolomite sinkhole on a private game farm in the Northern Cape, at roughly 1,500 m altitude. It is known for extreme-depth record dives, including the current Guinness women's record, and is not a public dive site.
Boesmansgat (Afrikaans for 'Bushman's hole') is a water-filled sinkhole in dolomite on Mount Carmel, a game farm near the road between Kuruman and Danielskuil in South Africa's Northern Cape. Divers reach the water by scrambling down from the surface and squeezing through a narrow crack; below it the flooded chamber opens out into a very large, deep void.
The sinkhole is famous for depth. Sheck Exley reached the bottom at 263 m in 1993, Nuno Gomes went to 282.6 m in 1996, and in 2022 Karen van den Oever made the dive Guinness World Records lists as the deepest scuba dive by a woman, 246.56 m. Published figures for the deepest point vary between about 282 m and 286 m, partly because the water level has changed over the decades.
The altitude matters as much as the depth. Because the surface lies at about 1,500 m, air pressure at the lake is lower than at sea level, so decompression has to be planned as if the dive were deeper than the gauge shows; Gomes's 1996 dive was treated as roughly equivalent to a 337-339 m sea-level dive. Dives here are long, multi-gas expeditions with large support teams.
Boesmansgat has also seen deaths. A diver lost in the 1990s was found on the slope at about 270 m by Dave Shaw in 2004, and Shaw died in early 2005 while trying to recover him.
The site is on private land and no public access procedure was found. It should be read as an expedition venue, not as a destination for visiting divers.
भूविज्ञान
Boesmansgat is a collapse sinkhole in dolomite. Accounts describe a small entrance crack leading into a flooded chamber that widens rapidly with depth, with a silty floor at the bottom.
पानी, प्रवाह और बाढ़
The water is clear and was about 19 C when measured on dives in 1996 and 2002, but brown mud on the walls absorbs light. A 2002 report noted that the water level had fallen over time, which made older depth markers on fixed ropes inaccurate.
यह क्यों मायने रखता है
Divernet describes Boesmansgat as the third-deepest known sinkhole in the world. It has hosted a series of depth records: Exley's 263 m in 1993, Gomes's 282.6 m in 1996, Verna van Schaik's 221 m women's record in 2004, and Karen van den Oever's 236.04 m (2021) and 246.56 m (2022) dives, the latter recognised by Guinness World Records.
परिस्थितियाँ
About 19 C in reports from 1996 and 2002; no recent measurement found. Visibility was described as clear, with silt on the bottom. The altitude of about 1,500 m changes decompression requirements.
प्रकाशित स्रोतों से सामान्य अनुमानित दायरे, वर्तमान परिस्थितियाँ नहीं।
सर्वे और एक्सप्लोरेशन इतिहास
| 1988-04-04 | Diaan Hanekom and Nuno Gomes dived to 123 m. [4] |
| 1993-08 | Sheck Exley reached 263 m, the first diver to reach the bottom. [4] [6] |
| 1996-08-23 | Nuno Gomes reached 282.6 m on a solo dive lasting about twelve hours. [4] [6] |
| 2004-10 | Dave Shaw reached 270 m on a rebreather and located the body of a diver lost in the 1990s. [4] |
| 2005-01 | Dave Shaw died during the recovery attempt; his support diver survived with serious decompression illness. [4] |
| 2021-03 | Karen van den Oever reached 236.04 m with support from a South African club. [5] |
| 2022-10-27 | Karen van den Oever reached 246.56 m, listed by Guinness World Records as the deepest scuba dive by a woman. [7] |
प्रवेश द्वार और डाइव साइटें
One natural entrance is documented: a small crack, roughly 1.5 m by 3 m, through which divers drop to the water. It is on a private farm and not publicly accessible.
अभिमुखीकरण के लिए, navigation के लिए नहीं। खोखले बिंदु अनुमानित हैं।
आगे की पढ़ाई
इस पृष्ठ का हर तथ्य, अपने source के साथ (18)
| तथ्य | स्थिति | स्रोत |
|---|---|---|
| Boesmansgat is on Mount Carmel, a game farm near the road between Kuruman and Danielskuil in the Northern Cape. | रिपोर्ट किया गया | [1] [2] |
| Area-level coordinates rounded from the published location of the sinkhole between Kuruman and Danielskuil; the exact entrance is on private land.Rounded to 0.1 degree on purpose (restricted private site). | रिपोर्ट किया गया | [3] [1] |
| The sinkhole lies at about 1,500-1,550 m above sea level.Gomes's history page gives 1,550 m; GUE gives about 1,500 m; Divernet gives 1.55 km. | रिपोर्ट किया गया | [4] [1] [5] |
| Nuno Gomes reached 282.6 m in Boesmansgat on 1996-08-23.Mail & Guardian (1996) reported 283.3 m measured on the descent line; GUE (2002) quotes 286 m for the deepest point reported by Gomes. Water level changes also alter the figure. | स्रोतों में विरोधाभास | [4] [6] |
| Corrected for altitude for decompression purposes, Gomes's 282.6 m dive is given as equivalent to 339 m at sea level.The history page gives 339 m; the record page gives 337 m. | स्रोतों में विरोधाभास | [4] [6] |
| On 1988-04-04 Diaan Hanekom and Nuno Gomes reached 123 m. | रिपोर्ट किया गया | [4] |
| In August 1993 Sheck Exley dived to 263 m and became the first diver to reach the bottom. | रिपोर्ट किया गया | [4] [6] |
| In late October 2004 Dave Shaw reached 270 m on a rebreather and found the body of a diver lost in the 1990s. | रिपोर्ट किया गया | [4] |
| Dave Shaw died during the early-2005 attempt to recover that body; his death was attributed to respiratory failure linked to gas density at depth.Secondary account on Nuno Gomes's site; Wikipedia dates the death to 2005-01-08. | रिपोर्ट किया गया | [4] |
| Verna van Schaik reached 221 m in Boesmansgat in 2004, a women's depth record.Gomes's page gives 2004-10-25; Wikipedia gives 2004-11-24. | स्रोतों में विरोधाभास | [4] |
| Karen van den Oever reached 236.04 m in Boesmansgat in March 2021. | रिपोर्ट किया गया | [5] |
| Guinness World Records lists Karen van den Oever's dive of 246.56 m in Boesmansgat on 2022-10-27, lasting 8 h 11 min, as the deepest scuba dive by a woman.Divernet (2022-10-30) printed 246.65 m before Guinness verification. | सत्यापित | [7] |
| Water temperature of about 19 C was reported in 1996 and 2002.Both observations are more than 20 years old. | पुराना हो सकता है | [4] [1] |
| A 2002 trip report noted that the water level had dropped over time, so depth markers on ropes placed in the early 1990s were no longer accurate. | पुराना हो सकता है | [1] |
| Divers drop through a small crack, roughly 1.5 m by 3 m, to reach the water. | रिपोर्ट किया गया | [1] |
| Boesmansgat is a dolomite sinkhole. | रिपोर्ट किया गया | [8] |
| Divernet describes Boesmansgat as the world's third-deepest known sinkhole. | रिपोर्ट किया गया | [5] |
| No public access procedure, fee or permit scheme for diving Boesmansgat was found; the documented dives in 2021 and 2022 were supported expedition-style dives organised with a South African club. | रिपोर्ट किया गया | [1] [2] [5] |
सत्यापित: किसी आधिकारिक या प्राथमिक स्रोत से पुष्टि हुई जिसे हमने खोला। रिपोर्ट किया गया: केवल द्वितीयक स्रोत से। स्रोतों में मतभेद: नोट में दोनों संस्करण दिए गए हैं। पुराना हो सकता है: हमें मिला सबसे नया स्रोत भी पुराना है।
ऊपर दिए गए sources से हमारे अपने शब्दों में लिखा गया। सुधार की रिपोर्ट करें