Yea those two guys died, however in the 40's and 50's, film makers used a lot of real WWII footage due to no CGI, with a lot of people actualy dying in the course of their duty.
I think that that bit of footage is actualy also used in
Flying saucers v's Earth or some Sci-Fi flik like that. Saw it on the tely a couple of weeks ago.
Still should make you think of the real dangers those guys faced...
Sharrk...