"Sub-Smash" is the eighth episode aired of the first series of UFO - a 1970 British television science fiction series about an alien invasion of Earth. The screenplay was written Alan Fennell and the director was David Lane. The episode was filmed between 18 November to 28 November, 1969 and aired on the ATV Midlands on 11 November, 1970. Though shown as the seventh episode, it was actually the seventeenth to have been filmed.[1][2]

UFO episode
Episode no.Season 1
Episode 8
Directed byDavid Lane
Written byAlan Fennell
Production code18 November to 28 November, 1969
Original air date11 November, 1970 (ATV Midlands)

The series was created by Gerry Anderson and Sylvia Anderson with Reg Hill, and produced by the Andersons and Lew Grade's Century 21 Productions for Grade's ITC Entertainment company.[3]


When a freighter is sunk mid-Atlantic by an undersea UFO, Straker joins the crew on Skydiver to investigate. Whilst searching in the area where the ship was lost, Skydiver is attacked by a UFO and damaged, sinking to a ledge on the sea bed. Skydiver is able to launch Sky One that tracks and destroys the UFO in earth's atmosphere.

Each of the crew must take it in turn to use a single, faulty escape hatch that now takes 90 minutes to reset after each use. Barry attempts to use an alternate hatch but fails. Two crew members reach a rescue craft at the surface, but Lt. Tony Chin succumbs to his injuries.

Straker and Barry are left on the submarine - Straker dealing with his claustrophobia and Barry stuck in the inoperative escape tube. They finally manage to escape the sub when it is blown off the ledge and they can access unblocked missile tubes.[4]




Production notes

Anthony Chinn is one of 11 actors to appear in both Doppelgänger and the UFO series.

Locations included Neptune House, BBC Elstree Studios, Borehamwood; and Marlyn Cottage, Ley Hill, Buckinghamshire.


  1. "UFO Episode Guide - Sub-Smash". Fanderson. Retrieved 18 October 2017.
  2. "UFO Characters - Sub-Smash". SHADO Library. Retrieved 18 October 2017.
  3. "Underappreciated TV: UFO". Den of Geek. Retrieved 18 October 2017.
  4. Bentley, Chris (10 January 2003). The Complete Book of Gerry Anderson's UFO. 978-1903111659. p. 65. ISBN 978-1903111659.
Last produced:
"Kill Straker!"
UFO episodes Next produced:
"The Sound of Silence"
Last transmitted:
"Kill Straker!"
Next transmitted:
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