Bathyscaphe Trieste, before a dive into the Marianas Trench]
A bathyscape, bathyscaphe, or bathyscaph is a free-diving self-propelled deep-sea
diving submersible, consisting of a crew cabin similar to a bathysphere suspended below a float (rather than from a surface cable, as in the classic bathysphere design).cite journal |author=Brand, V |title=Submersibles - Manned and Unmanned. |journal=South Pacific Underwater Medicine Society journal |volume=7 |issue=3 |date=1977 |issn=0813-1988 |oclc=16986801 |url=http://archive.rubicon-foundation.org/6154 |accessdate=2008-07-10 ]
The float is filled with
gasolinebecause this is readily available, buoyant, and for all practical purposes, incompressible. The incompressibility of the gasoline means the tanks can be very lightly constructed as the pressure inside and outside of the tanks equalises and they are not required to withstand any pressure differential at all. By contrast the crew cabin must withstand a huge pressure differential and is massively built. Buoyancycan be trimmed easily by replacing gasoline with water, which is denser.
To descend, a bathyscaphe floods air tanks with sea water but unlike a
submarinethe water in the flooded tanks cannot be displaced with compressed air to ascend because the water pressures at the depths for which the craft was designed to operate are too great. For example, the pressure at the bottom of the Challenger Deepis more than seven times that in a standard "H-type" compressed gas cylinder. Instead, ballast in the form of iron shotis released to ascend, the shot being lost to the ocean floor. The iron shot containers are in the form of one or more hoppers which are open at the bottom throughout the dive, the iron shot being held in place by an electromagnet at the neck. This is a fail-safedevice as it requires no power to ascend; in fact, in the event of a power failure, shot runs out by gravity and ascent is automatic. Auguste Piccard, inventor of the first bathyscaphe, composed the name "bathyscaphe" using the Greek words "bathys" ("deep") and "skaphos" ("ship").
right|thumb|250px|Internal arrangement of Trieste.Click to enlarge.
The first bathyscaphe was dubbed "
FNRS-2", named after the Fonds National de la Recherche Scientifique, and built in Belgiumbetween 1946-48 by Piccard. Propulsion was provided by battery-driven electric motors.
Piccard's second bathyscaphe was "Trieste", which was purchased by the
United States Navyin 1957. It had two water ballast tanks and eleven buoyancy tanks holding 120,000 litres of gasoline. [cite web
1960"Trieste", carrying Piccard's son Jacques Piccardand Lt. Don Walsh, reached the deepest point on the earth's surface, the Challenger Deep, in the Mariana Trench. As of 2008 the two remain the only people to reach this extreme depth. No manned vessel has ever repeated this feat. In 1995, the Japanese sent an unmanned submersible to this depth, Kaikō, but it was later lost at sea. Today there are no submersibles that can reach this depth.
The onboard systems indicated a depth of 37,800 ft (11,521 m) but this was later corrected to 35,813 ft (10,916 m) by taking into account variations arising from salinity and temperature. Later and more accurate measurements made in 1995 have found the Challenger Deep to be shallower at 35,798 ft (10,911 m).
The bathyscaphe was equipped with a powerful light, which illuminated a small flounder-like fish, putting to rest the question of whether or not there was life at such a depth in the complete absence of light.Fact|date=September 2008
In popular culture
* Bathyscaphes are a central plot element in the "De IJzeren Schelvis" (
1955) episode of Willy Vandersteens " Spike and Suzy" comic series.
* Bathyscaphe is also the name of a character in the
animeseries " World of Narue". A scene in the show makes reference to the origins of the name in relation to the deep sea craft. In the show, Bathyscaphe is a starshipwhich has taken the form of a sentient androidwhilst residing on Earth.
* A stolen bathyscaphe serves as a plot element in the
Alistair Macleannovel " Fear is the key"
* [http://www.history.navy.mil/photos/sh-usn/usnsh-t/trste-b.htm The US Navy account of the dive, with photographs]
* [http://www.bathyscaphtrieste.com/ History of the Bathyscape Trieste]
* [http://college.hmco.com/history/readerscomp/ships/html/sh_034900_fnrs2.htm FNRS-2]
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Bathyscaphe — Trieste Les bathyscaphes sont des engins sous marins d exploration abyssale. En service de 1948 à 1982, ils ont été les seuls engins capables d atteindre les plus grandes profondeurs ( 10 916 mètres, dans la fosse des Mariannes, le 23… … Wikipédia en Français
bathyscaphe — [ batiskaf ] n. m. • 1946; de bathy et scaphe ♦ Appareil habitable destiné à conduire des observateurs dans les grandes profondeurs sous marines. ● bathyscaphe nom masculin Engin autonome de plongée à grande profondeur, habitable et dont la… … Encyclopédie Universelle
bathyscaphe — diving apparatus for reaching great depths, 1947, name coined by its inventor, Swiss scientific extremist Prof. Auguste Piccard (1884 1962), from Gk. bathys deep + skaphe light boat, skiff, a basin, a bowl, anything dug or scooped out, from… … Etymology dictionary
bathyscaphe — /bath euh skayf , skaf /, n. Oceanog. a navigable, submersible vessel for exploring the depths of the ocean, having a separate, overhead chamber filled with gasoline for buoyancy and iron or steel weights for ballast. Also, bathyscaph /bath euh… … Universalium
Bathyscaphe — batiskafas statusas T sritis ekologija ir aplinkotyra apibrėžtis Giliavandenis autonominis savaeigis aparatas okeanografiniams ir kt. tyrimams. atitikmenys: angl. bathyscaphe vok. Bathyscaph, m; Bathyscaphe, n rus. батискаф, m … Ekologijos terminų aiškinamasis žodynas
bathyscaphe — batiskafas statusas T sritis ekologija ir aplinkotyra apibrėžtis Giliavandenis autonominis savaeigis aparatas okeanografiniams ir kt. tyrimams. atitikmenys: angl. bathyscaphe vok. Bathyscaph, m; Bathyscaphe, n rus. батискаф, m … Ekologijos terminų aiškinamasis žodynas
bathyscaphe — bathyscaph ath y*scaph, bathyscaphe ath y*scaphe . navigable deep diving vessel for underwater exploration. Syn: bathyscape. [WordNet 1.5] … The Collaborative International Dictionary of English
Bathyscaphe — Ba|thy|scaphe [... ska:f], der od. das; [s], [...fə], Ba|thy|skaph, der; en, en [frz. bathyscaphe, zu lat. scapha = Boot < griech. skáphē = Gefäß]: (von dem schweizer. Tiefseeforscher A. Piccard [1884 1962] entwickeltes) Gerät zum Tauchen in… … Universal-Lexikon
Bathyscaphe — Ba|thy|scaphe [... ska:f] der od. das; [s], u. Ba|thy|skaph der; en, en <aus gleichbed. fr. bathyscaphe, dies zu gr. bathýs »tief« u. skáphē »Gefäß, Trog«> (von dem Physiker A. Piccard, 1884 1962, entwickeltes) Tiefseetauchgerät … Das große Fremdwörterbuch
bathyscaphe — or bathyscaph noun Etymology: International Scientific Vocabulary bathy + Greek skaphē light boat Date: 1947 a navigable submersible for deep sea exploration having a spherical watertight cabin attached to its underside … New Collegiate Dictionary