The name on the side of the freighter at the beginning of
the episode is Kingston.
A previously unseen alien ship (possibly remote controlled)
is featured in this episode. It launches from a submerged
UFO and becomes airborne to fire a laser weapon at sea
ships, destroying them.
The rescue plane that rendezvous with Skydiver 1 is
SHADAIR Albatross 15. It also appeared in
In this episode, the aliens have somehow clandestinely
constructed a dome under the Atlantic Ocean from which to
conduct seek and destroy sorties against Earth shipping.
"The Cat With Ten Lives", this
snippets of events from later in the episode after the
opening titles instead of launching straight into Act I.
Both episodes were written and directed by
This episode reveals that Earth has at least one (probably
more) manned deep space probes to aid in early detection of
approaching UFOs. Deep Space Probe 87 (DSP-87) appears here,
reporting the approach of 25 UFOs, but is destroyed by one
Notice at 7:20 on the DVD that Lt. Anderson is wearing a
zipped up jacket over his SHADO tunic to hide it from the
civilian employees of Harlington-Straker Studios as he meets
with Straker on a soundstage.
This episode reveals there is a space observation platform
called Watchdog used by SHADO. It is apparently mobile, as
Straker orders it to be moved to zone NML-12 to watch for
movements of the amassed UFOs detected there by Deep Space
Probe 87 before its destruction.
The documentary crew's underwater photographer is pulled out
of the sea dead, the air line to his scuba tank cut. But who
cut it? He'd reported seeing a strange, silver flying fish
(the alien laser probe) moving towards him just before
communication was lost. The alien probe is capable blowing
up a sea vessel with its laser, but not, seemingly, such a
fine-tuned job as slicing a thin air hose! Was there an
actual alien swimming in the water as well? If so, for what
All of the divers in this episode wear "bite-down" oxygen
pieces for breathing, so they shouldn't be able to speak
underwater as they do!
The director of the fishing documentary remarks that the
unusual appearances of warm water fish are occurring off the
coast Cornwall. Cornwall is a county of England, making up the
southernmost peninsula of the country.
A previously unknown Skydiver captain appears in this
episode for his only appearance.
This episode reveals that Skydiver 1 (and, presumably, all
Skydivers) carries "sea sleighs", small one-man underwater
scooters that can tow a person through the depths.
Foster accompanies Straker on the underwater trek to the
alien dome. In "Ordeal",
Straker remarked (within Foster's dream) that Foster
is an expert skin diver.
The largest number of UFOs described (though not seen) in
any story of the series is in this episode, at 50.
After entering the underwater dome, it sounds like Foster
says, "It's been a UFO," and the camera pans over a circular
image in the dome's floor. Possibly it is meant to imply
that a UFO landed on the sea floor and expanded a dome-like
structure around itself, forming the alien underwater base
in which Foster and Straker now find themselves.
From the stripe patterns on the walls, it can be seen that
the same walls of the interior of the alien dome are used
repeatedly from shot-to-shot as Straker and Foster make
their way through the corridors!
Apparently Straker isn't very observant. He should have
known that the "Foster" he bumps into in the dome after
separating from him earlier was a duplicate because he is
wearing normal clothing instead of the wetsuit they both
At 35:14 on the DVD, we see that the clock installed on
Skydiver is a Secticon. Another Secticon model clock is seen
At 45:29 on the DVD, we see the Lunar Module on the launch
pad at Moonbase. But in later shots at 46:28 and 47:28, the
Lunar Module is missing from the launch pad!
The scene of the UFO getting shot down over Earth and
spewing orange smoke is borrowed from
add a drop of castor oil.wav
a cup of Skydiver coffee.wav
in unknown country.wav
ever had that feeling you've been here before?.wav
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