Question 1: The speed of some
of these objects (estimated from ________ of
their sound frequency) was in the range of 200 km/h, much higher
than any then-known man-made vessel.
Question 2: The three main theories about the origin of
this phenomenon propose some secret new technology developed by the
US or ________, an unknown marine animal or alien activity.
Question 4: That would explain
the quackers' active behavior, as squids are known to possess a
high level of intelligence and could possibly mistake subs for
their eternal rivals, ________.
Question 5: These
sounds appeared when submarines passed certain zones in the sea,
and behaved as if they were emitted by some moving underwater
object, which, however, failed to register on the ________.
Question 7: During the height of the ________ these mysterious happenings greatly affected the morale of
submarine crews, and as such were seen as direct threats, even if
they exhibited no hostile intent.
Question 9: Basilosaurs are of special
interest to ________, who propose that they are
somehow still alive, and sea serpents of marine lore are true
sightings of these animals.
Question 10: The ________ was invited to create a joint commission
with the representatives of the Navy, as this phenomenon was
identified as a potential national security risk.
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