That's the big main Odessa airfield. It is a once-only-used type, but I don't know by heart what could be special about it apart from the barracks there - but they are also not very special
. And then maybe there was that big KZ-like* fence around it?
(* erm... it reminded me to Auschwitz just th efirst time I saw that object - sorryx for maybe not being PC...)
==> No clue what could be the cause
.