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How intriguing. Thanks for all the various links provided.
Looking at the image referenced by Glen (and others) I can't visualise a geometry which would allow for the object to be a shaft. The lighting - to my mind at least - seems to signify a hole through a significant amount of rock (or whatever) into a void.
Most of the seven images are close to circular. Why? Perhaps these are collapsed domes or, maybe, even caused by a meteorite punching through the skin of the volcano. In the latter case I would think that the depth of the 'hole' would have to be significant otherwise the pressure wave produced by its final impact would surely have caused some ejecta to be visible. A small impacting body which, on contact (after piercing the upper skin) caused the weakened area to collapse also seems unlikely as I would again suspect that some ejecta would be clearly visible.
The image of 'Jeanne' or 'F' in the montage of the seven sisters does appear to have some outflow, though whether that is ejecta or lava flow I have no idea.
Definitely intriguing.
*edit*
Sorry, Ispom, I forgot to include that I too have the problem of "up" and "down" when it comes to some images. At times it's hard to convince the mind that it's giving me wrong information.
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