The deepest geothermal hot spring measured by a plumb line is 305.41 m (1,002 ft), and is located at The Springs Resort and Spa (USA) in Pagosa Springs, Colorado, USA. The spring was measured on 20 August 2011. The spring was measured by a hydrologist from Basin Engineering in Durango, Colorado. The actual depth of the spring is unknown, as the plumb line measured a maximum depth of 1,002 ft, and it ran out before hitting the bottom of the spring.
The deepest, and indeed largest, operating neutrino observatory is the Super-Kamiokande, a joint US-Japanese research facility located 1,000 m (3,280 ft) below ground in the Mozumi Mine (Kamioka Mining and Smelting Co.) in Hida city, Gifu, Japan. It consists of a vast cylinder measuring 40 m (131 ft) in height and 40 m (131 ft) in diameter, which is filled with ultra pure water. The walls are covered with 13,000 sensitive light detectors called photomultiplier tubes, which watch the water for Cerenkov light – the
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A 2.5 kiloton nuclear device was detonated at the bottom of a shaft 2,850 m (9,350 ft) deep at a location 60 km (37 miles) south of Nefte-yugamsk, Siberia, Russia, on 18 June 1985. The detonation was carried out in an attempt to stimulate oil production. For a comparison, the Hiroshima bomb had a yield of around 15 kilotons. The Russians carried out 116 nuclear explosions between 1965 and 1988 in a program known as No. 7 – Nuclear Explosions for the National Economy. Known
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The deepest live radio broadcast was performed underground by CBC Radio Points North (Canada) at the 7,680 ft (2,340 m) level of Creighton Mine, Sudbury, Ontario, Canada on 24 May 2005. Dan Lessard (Canada) hosted the 2 hour show consisting of recorded material as well as live music and interviews from a refuge station deep below the surface.
The deepest cargo salvage from a shipwreck was carried out by Blue Water Recoveries Ltd (UK), when they salvaged 179 tonnes of blister copper and tin ingots off the wreck of the merchant vessel SS Alpherat from a depth of 3,770 m (12,370 ft). The salvage took place during February 1997 in the central Mediterranean just east of Malta where Alpherat had been sunk by a bomb dropped from a German Junkers 88 aircraft while transiting in convoy during World War II. Blue Water Recoveries
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The deepest part of the ocean was first pinpointed in 1951 by HM Survey Ship Challenger in the Mariana Trench in the Pacific Ocean. On 23 January 1960 the manned US Navy bathyscaphe Trieste descended to the bottom, and on 24 March 1995 the unmanned Japanese probe Kaiko recorded a depth of 10,911 m (35,797 ft), the most accurately ever measured, when it also reached the bottom. If Mount Everest was dropped into the Mariana Trench, it would disappear 2,000 metres below the surface.
The Deepwater Horizon semi-submersible drilling rig, whilst operating in the Tiber oil field in the Gulf of Mexico achieved a drilling vertical depth of 10,062 m. This was accomplished working in water which was 1,259 m deep.
On 18 December 2009 US scientists announced they had filmed a volcanic eruption more than 1,200 m (3,900 ft) deep in the Pacific Ocean near Samoa. The footage, captured in May 2009 by a robotic submersible, shows molten lava erupting from the West Mata volcano, one of the most active submarine volcanoes in the world.
Verna van Schaik (South Africa) dived to a depth of 221 m (725 ft) in the Boesmansgat cave in South Africa’s Northern Cape province on 25 October 2004. The dive lasted 5 hr 34 mins, of which only 12 minutes were spent descending.
The deepest ho-ho-ho measured 62.81 Hz and was performed by James Gower (UK) on the set of Guinness World Records – Smashed, in London, UK, on 23 April 2009. The depth of the ho ho ho was measured with a laryngograph. The laryngograph is a device for the noninvasive measurement of the time variation of the degree of contact between the vibrating vocal folds during voice production. The lower the Hz figure the lowest (deepest) the pitch.