<underground_description>A 14m pitch drops into rift passage quickly choking to the east. To the west, a short walk reaches a 3m climb to a higher level, choking rapidly.</underground_description>
<notes>Thought by the Austrians to be one of a group of <ahref="../1623/36/36.html">shafts numbered 36</a> in the Kataster, but the location of B1 relative to <ahref="b4.htm">B4</a>, which is very near 36, precludes this interpretation. Unfortunately, B1 was not relocated in a search in 1990.</notes>