Digging bees / Пчелы копают (Golog-first posting)

On the edge of a sandy road, I noticed some bees digging in the ground. I have no idea what species they are, but here are the photos:

Thanks for watching! If any of you know what species these bees are, please let me know in the comments.

Edit: I found what species it is, it is a grey-backed mining-bee (Andrena vaga).

All photos taken with an Olympus Stylus 1s at 42mm.