[clubm8]

>Are there any satellite imaging surveys or aerial surveys 50+ years ago that can confirm the assertion that the cave entrance has been covered with snow 100% of the time before 50 years ago?

You think people comb through satellite photos to look for cave entrances?

[assblaster]

I was only asking what the basis was for the assertion that the cave entrance has been persistently covered with snow year-round prior to 50 years ago.