impenetrability

US /ɪmˌpen.ə.trəˈbɪl.ə.t̬i/
UK /ɪmˌpen.ə.trəˈbɪl.ə.t̬i/
1.

sự không thể xuyên thủng

the quality of being impossible to see through or go through:

:
It's hard to get access to most of the animals because of the impenetrability of the habitat.