Hebrew to English Tech/Engineering Military / Defense aerial photography - War of Attrition

Very long sentence describing activities at beginning of War of Attrition --

"In this period, the interpreters became acquainted up close with characteristics of the new bases. Among them stood out the double מנ"א ה"ז הכפול, of which especially good photos were received in a “backpack” low trip and מנ"א 7, the gigantic rooms where every element is placed in a kind of small “animal pen” of aircraft, built from massive concrete, that was almost impenetrable by the bombs the aircraft dropped. "

Any help will be greatly appreciated!

Thanks!