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<title>Cambridge Underground 1982: 115 sketch survey</title>
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<center><font size=-1>Cambridge Underground 1982 p 9-10</font>

<h2>115 provisional survey (1981)</h2></center>

<p><img alt="A4 survey at 100 dpi - 20 k gif" width=800 height=565
src="115.png">

<hr />
<h2><a name="survey">The</a> Survey</h2>

<p>Surveying was not the strong point of this year's expedition; it is hoped
that we can do better next year. The entrance series of 115 to the head of
the Ramp and 41 down to the pitch just above Junction Chamber were surveyed
to BCRA grade 5 in 1980 and these surveys have been published in Proc. UBSS
Vol. 16(1). 115 from the ramp to the bottom of the pitches and the connection
were both surveyed to Grade 4 (the survey of the connection is reproduced
here), making a closed traverse with the surface survey between the
entrances. Unfortunately, though they closed vertically to within 2m, the
plan closure was wildly out. It is thought that this might have been due to a
sticky compass on the 1980 survey. The length of Pete's Purgatory was found
to be 800m, but no other details were measured. Below this, the section of
the streamway from the inlet to the 'twelve foot climb' (marked as c5) was
surveyed to grade 3 and this is extrapolated downstream on the grade 1 survey
to give a total depth of 680m plus or minus 40m. One point which the
elevation does not bring out is the way that Stellerweg spirals round on
itself with changes of direction at the big pitch and at Junction Chamber.
The final direction of the streamway seems to be northwest - heading back
into the mountain and away from the lake.
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