Pictures of lunar cave entrances: https://phys.org/news/2015-08-technology-illuminate-mystery-moon-caves.html https://phys.org/news/2015-08-technology-illumina

Pictures of lunar cave entrances: https://phys.org/news/2015-08-technology-illuminate-mystery-moon-caves.html https://phys.org/news/2015-08-technology-illuminate-mystery-... Three photos are from the Marius Hills location the article mentioned, though I'm not sure if it's the precise tunnel they investigated.