Operation TRACER: Six men, entombed in Gibraltars rock to spy on the Germans. During the Second World War, the British outpost of Gibraltar was the gateway to Mediterranean, and in early 1941 it looked to be the next in line for invasion by Axis forces. In the midst of a potential German takeover, a top secret plan codenamed TRACER was being developed to hide observers and spies within in the rock itself.

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Longest Winter by Meredith Hooper:
https://amzn.to/3G7AS2s

Big thanks to Jim Crone for all his assistance in photos, fact checking and lots more! Website: http://jimcrone.co.uk/

Photo Credit Moshi Anahory for some of the amazing Tracer Cave photos: https://www.flickr.com/photos/mosh70/...

Great video by Ungerground Gibraltar on the subject:
   • Underground Gibraltar Ep 05 Pt 02  

00:00 - A Strange Discovery
02:09 - 1941: Britain on the Brink
03:24 - Gibraltar: Key to the Mediterranean
05:53 - Fortress Gibraltar
07:31 - Preparing for the Worst
08:16 - Ultra-Secret Planning
08:39 - TRACER Takes Shape
09:27 - Layout of the TRACER Observation Post
15:31 - Thanks to our sponsor (not)!
16:32 - George Murray Levick
18:45 - TRACER Approaches Completion
19:19 - Dr. Bruce Cooper
19:59 - Threat to Gibraltar Passes
20:57 - TRACER on Gibraltar Stands Down
21:23 - Rediscovered After 50 Years
25:07 - Dr. Bruce Cooper - Life After TRACER
26:27 - More TRACER Caves To Be Found?
29:00 - Conclusion
29:30 - Waffling On a Bit