Earlier this year, a Ukrainian collective of daredevils called Mustang-Wanted published a terrifying video of them climbing—and hanging from—various tall buildings and objects. This week, the group posted a new video that's more nerve-racking than the first.

In case you, for whatever insane reason, were thinking of imitating the stunts, here's a message from "Mustang," the group's leader, via the Mustang-Wanted website: