In the course of our wanderings, we came across an interesting rusty artefact. The base camp brains trust reckons this to be a reserve fuel tank likely jettisoned from a second world war era plane.
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+Our first target was to find the entrance to 1623/261. This is a fairly insignificant cave: <100m long, <50m deep. The interesting feature is that the cave is aligned with development in deep Balkonhöhle, specifically Charon, so I was interested to discover if there were any obvious similarly aligned surface features. Sure enough, the 1623/261 entrance was found to be in the side of a chossy gully. We didn't have a compass, so cannot confirm the alignment, but it seems highly probable that this surface feature is related to development of 1623/261 and deep Balkonhöhle. (There is another similarly aligned ARGE cave - Haldenloch (appears not to have a number) - that is further away to the northeast that we didn't visit.)
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T/U: 0.5 hours