When it hits a large object, such as a silent enemy submarine or a whale, it bounces back and is measured by instruments that can plot the object's size, shape and location.
(it; hits; a large object) (it; bounces back; T:When it hits a large object, such as a silent enemy submarine or a whale) (it; is measured; by instruments; T:When it hits a large object, such as a silent enemy submarine or a whale) (instruments; can plot; the object's size, shape and location)
it it it instruments
hits bounces back is measured can plot
a large object
T:When it hits a large object, such as a silent enemy submarine or a whale
by instruments T:When it hits a large object, such as a silent enemy submarine or a whale
the object's size, shape and location