'This instrument, in its simplest form a tube with mirrors, enables the sub crew to see above the surface of the water'
a periscope
SUBS: This instrument, in its simplest form a tube with mirrors, enables the sub crew to see above the surface of the water
This instrument, in its simplest form a tube with mirrors, enables the sub crew to see above the surface of the water
This instrument, in its simplest form a tube with mirrors, enables the sub crew to see above the surface of the water
SUBS
a periscope
SUBS