Where was Doctor Who's Sea Devils filmed in Portsmouth?
In October 1971 Doctor Who fought sea monsters on the Fraser Gunnery Range at Eastney. Plus beam engines, a ferry that may date from the 1700s and a fort that now makes gin.
Doctor Who's The Sea Devils filmed shore scenes at the Royal Navy's Fraser Gunnery Range in Eastney on 21, 22 and 25 October 1971. The serial was broadcast from 26 February to 1 April 1972.
Doctor Who once fought sea monsters on your gunnery range. If you live near Eastney in Portsmouth, that range is part of television history.
The short answer
According to Wikipedia's Eastney page, the Doctor Who serial The Sea Devils filmed at the Royal Navy Fraser Gunnery Range in Eastney. The Doctor Who Locations website gives the dates as 21, 22 and 25 October 1971, covering the scenes in which the Sea Devils attack and the Navy defeats them. The serial was broadcast from 26 February to 1 April 1972. One honest caveat: the locations site places the range in Portsmouth, and the Eastney link comes from Wikipedia and a Portsmouth News headline, "How Dr Who saved the day at Eastney". Our notes also say the range is now derelict and private.
Two Victorian beam engines
The Eastney Beam Engine House is Grade II listed and dates from 1887. It contains two 150 horsepower James Watt and Co beam engines, part of a plan to improve Portsmouth's sewage system. They pumped sewage out into the ebb tide. According to Grace's Guide, one is usually steamed when the museum is open, though open days are limited. One report gives 1874 for the engines, which conflicts with 1887, so we call them Victorian.
The Hayling ferry
The Hayling ferry from Eastney is claimed to have operated since before 1850, possibly from the 18th century. That is a single-source claim, so we say it is "said to" be that old.
A very long barracks
Eastney Barracks was designed by William Scamp, and the Royal Marine Artillery moved in in 1867. It remained their headquarters until 1995. It has seven linked blocks and the second longest barracks frontage in the country, after the Royal Artillery Barracks at Woolwich. That statement comes from Wikipedia and a Geograph caption with the same wording, so it is effectively one source.
Convicts and Fort Cumberland
Convicts were part of the workforce that built Fort Cumberland, many housed in prison hulks in Langstone Harbour. Strong Island says it is thought that over five million bricks were used. We say "millions". The Historic England listing describes Fort Cumberland as the last fortress built here and the final development of its type of design in Britain, and Wikipedia says it was the last fort with angle bastions built in the UK.
A fort that makes gin
Since 2018, Portsmouth Distillery has operated from the restored casemates of Fort Cumberland. The distillery makes rum as well as gin.
What we could not confirm
We found no sourced meaning for the name Eastney, and we left out a claim about railway carriages on Eastney Lake because it was uncited.
At a glance
Filmed: 21, 22 and 25 October 1971 at the Fraser Gunnery Range, Eastney.
Broadcast: 26 February to 1 April 1972.
Beam Engine House: Grade II listed, 1887, two 150 horsepower engines.
Barracks: Royal Marine Artillery from 1867 to 1995, with the second longest frontage after Woolwich.
Fort Cumberland: built partly by convicts, now home to Portsmouth Distillery.
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