Enormous Pre-Flood Mega-Structure Discovered in Siberia

This is interesting if it is natural or not, but I would like to have a better look at the place without quickly changing the picture to drawings or other places that have nothing to do with this site. It would be cool for us who probably will never get there to have a chance to form our own opinions. The 'doorways' definitely do not look natural.... at least the ones I saw in this video like at 3:49. Thank you for the information here and your work you have done!