User blog comment:FromDvToZombies/Black Ops III DLC 3 Gorod Krovi Zombies revealed! Treyarch is stepping up their game!/@comment-1916935-20160629161248/@comment-28286675-20160704225437

If not, they could always blame it on "Element 115 time travel displacements" like they did previously in maps such as Tranzit and Buried (Perhaps Buried even more so). Albeit, they did hint at it indirectly, it was still pretty much clear from that point on. Anyways, they will work similar to the Lunar Landers from Ascension.