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82 lines
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82 lines
4.2 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0//EN">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
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<title>Stellerweg system: the surveys</title>
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<link rel="stylesheet" type="text/css" href="../../css/main2.css" />
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</head>
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<body>
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<h2>Stellerweghöhlensystem surveys</h2>
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<p>Various low-grade surveys were published during the course of the
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exploration, but these were mostly A4 format and of limited value. After the
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cave was bottomed, A0-sized plan and elevations were prepared, and a reduced
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version of these was published at A3 size with the 1983 issue of Cambridge
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Underground. The <a href="../../years/1982/41gd.htm">descriptive
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article</a> which accompanied this survey makes a great deal of the supposed
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134° error in one compass. The compass was subsequently found to be
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in error by a much more believable 180° which renders the published
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survey wrong in one area.
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<p>The survey is, perhaps surprisingly, at its worst in that part of the cave
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first explored. The main Stellerweg route was surveyed at grade 4 (after
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correction for fridge north) in 1980 to the head of the Big Rift, but only by
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measuring rope lengths on pitches after that (the expedition was very pressed
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for time and manpower when this route was connected to 115 in 1981). Only a
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cursory survey was done of the German route, as we expected to obtain a copy
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of the original survey (from 1972 ?) - we are still waiting.
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<p>The survey of what became the "normal" route to the bottom is much
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better, being to grade 5 all the way from the 115 entrance to The Confluence.
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A short stretch from here to the 12' climb was not resurveyed in 1982, and
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hence relies on 1981 data done with a Silva compass, for which only grade
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3 is claimed. However, agreement between parts of the grade 3 survey and
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the subsequent grade 5 one is pretty good, so there is no reason to expect
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particularly poor quality here. From the 12' climb to the bottom was all
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surveyed, in 1982, to grade 5 by the dedicated minority who were actually
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hard enough to get this far down the cave (and stupid enough to push a low
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airspace duck at -700m - they deserved it).
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<p>Thus, the depth quoted on the 1983 published survey is almost entirely
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dependent on a grade 5 centre line which agreed well with other bits of
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survey where these existed. There are no significant closed loops to
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provide independent checks. The only known problem with the published
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survey is the section of passage drawn 46° out due to the "fridge
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north" calibration cock-up.
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<p>After the high entrances of <a href="../143.htm">143</a> and
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<a href="../144.htm">144</a> were explored, and the latter was connected
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into Stellerweg, and considerably more exploration was done in
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<a href="../142.htm">142</a>, including two connections into the main
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system, a lot more survey data was available, all of it above the Big Rift in
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Stellerweg. All these passages were drawn up, at a larger scale than the
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original published survey, and with the fridge north error corrected.
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However, this survey has never been published - CUCC stopped working in the
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cave and the project petered out.
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<p>A significant part of the survey (all of 142 and the passages of 41 from
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the entrance to the Big Pitch) is drawn up in machine-readable form, and
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extracts from this appear in these pages in the descriptions of the
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<a href="off41.htm#ent142">1623/142</a> and <a href="144.htm">1623/144</a>
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entrances. An overview of the whole survey (at a reduced scale) is also on
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the site <a href="hlevel.png">here</a>.
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A lot more survey work is expected in the cave over the next few
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years (and this has already started). One connection from
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<a href="../78.htm">Schwabenschacht</a> (1623/78) to the 1623/142 entrance
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has already been made, and other connections seem likely. It is hoped that we
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will also be able to obtain details of the other caves connected to the
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system, and be able to draw up a full survey of what is already at least a
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20km system.
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<hr />
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