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1982: Cambridge Underground report
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<h3>Stellerweghöhle-Schnellzughöhlensystem : The survey</h3>
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<p>Andy Waddington
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<p>During the period 1976-1981, surveying has not been the strong point of
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CUCC expeditions to Austria, mainly because of the limited man-weeks
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available, and the amount of exploration to be carried out. In 1982, when we
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were virtually certain of finding an end to Schnellzughöhle, it was
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considered essential to complete a survey of the system, since it was highly
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unlikely that a descent would be made later, merely for surveying purposes.
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This task was expedited by the fact that the 1982 expedition was in the field
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for almost four weeks.
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<p>The survey now published includes survey material from previous years, of
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those parts of the system that were not rigged in 1982, mainly in
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Stellerweghöhle. The survey from Stellerweg entrance to the start of the
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big rift was carried out in 1980, and was to grade four in all respects
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except one, namely that one of the compasses used had been left on top of Rob
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Shackleton's fridge and had recalibrated itself. Calibration in Austria
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showed it to have a 134 degree error, which has been allowed for in the data
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processing, but it is not certain that this calibration was constant at all
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times, so only grade three is claimed. The whole of the Big Rift down to the
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junction with the rest of the system at Junction chamber was surveyed only by
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measuring pitch lengths and so only grade two is claimed.
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<p>A surface traverse from the two entrances of Stellerweghöhle to the
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entrance to Schnellzughöhle, and extending to other entrances in the area was
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carried out to grade five, and is in close agreement with data from previous
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years. The survey from Schnellzughöhle to the Confluence was all to
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grade five, and agrees with the surveys done in 1980-81 to lower grade. From
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the confluence to the 12' climb (Another pitch), the survey relies on 1981
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data to grade three; in view of the agreement of other grade three surveys of
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previous years with the 1982 data, this is considered reliable. From the 12'
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climb to the bottom of the system, all surveying was done in 1982 and is to
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grade five.
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<p>Thus, of the 898m surveyed depth, all except a small portion is to BCRA
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Grade five, and though there are no closed loops, we feel confident that the
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depth is within plus or minus ten metres of that stated.
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<p>Calibration of instruments on the surface suggested a magnetic deviation
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of only 1.25 degrees. Since true north is difficult to determine accurately
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from local maps, which have no grid lines, and since the deviation is
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comparable with potential instrument errors, the survey has been drawn to
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magnetic rather than true north. Calibration of instruments between two fixed
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points on the surface will enable any additions to the survey to be
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accurately aligned in future years.
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<p>Data reduction was by the FORTRAN computer program SU 4.32 which is
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implemented on a dual processor ICL 2982 (not at Cambridge), and the
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centre-line plot was drawn using GHOST software on a Calcomp drum plotter.
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Survey detail was sketched onto the centre line plot and then traced and
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inked. The survey was originally drawn at a scale of 1:800, ie. on A0 paper,
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and reduced to its present scale for publication. Passage detail in the grade
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five parts of the survey were estimated and recorded in the cave, and drawn
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directly from the original sketches. Passage detail for the main route in
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Stellerweg was copied from the original 1980 survey drawn by Julian
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Griffiths. This involved an increase in scale, and so the detail in this area
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is probably not as accurate. Grade one survey data in areas near the
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Purgatory Bypass were estimated and recorded in the cave and drawn from the
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original sketches, while the Big Rift in Stellerweg was drawn from sketches
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made in 1980 from memory with measured pitch lengths.
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<!-- A.E.R.Waddington, February 1983. -->
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<hr />
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<!-- LINKS -->
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<ul id="links">
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<li><a href="../1983/41svy.htm">The truth</a> about the 1982 survey
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(from CU 1984)</li>
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<li>1982 Expedition info:
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<ul>
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<li><a href="log.htm">Logbook</a></li>
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<li>Main Expo report, Cambridge Underground 1983:
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<ul>
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<li><a href="report.htm">CUCC in Austria</a> - Phil Townsend</li>
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<li><a href="41gd.htm">Stellerweg Guidebook Description</a> by Pete Lancaster</li>
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<li><a href="41camp.htm">The Underground Camp</a> by Chas Butcher</li>
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<li><a href="newbit.htm">New Discoveries</a> 1982 by Mike Thomas</li>
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<li><a href="bats.htm">The Bats of 115</a> by Dave Brindle</li>
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</ul></li>
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<li><a href="bcracc.htm">BCRA Caves & Caving Report</a></li>
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</ul></li>
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<li><a href="../../pubs.htm#pubs1982">Index</a> to all publications</li>
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<li><a href="../../index.htm">Back to Expeditions intro page</a></li>
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<li><a href="../../../index.htm">CUCC Home Page</a></li>
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</ul>
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</body>
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