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Cloch Lighthouse Anti-submarine Tethering Points is a pair of First World War naval installations located in Scotland. The two tethering points, positioned 15 metres north and 10 metres south-west of Cloch Lighthouse, were used to secure anti-submarine nets or booms during the conflict. Such defensive systems were deployed at strategic coastal locations to protect shipping and naval vessels from submarine attack, a growing threat in the early twentieth century.
The monument sits upon bedrock of the Inverclyde Group, a geological formation of sandstone, siltstone and mudstone dating to the Osagean period. This relatively stable foundation provided the solid anchorage required for the heavy tethering apparatus. The paired installation reflects the standard practice of securing protective barriers with multiple anchor points distributed across the site.
The tethering points are protected as a scheduled monument by Historic Environment Scotland under reference SM12802. Their survival preserves evidence of the scale of coastal defence preparations during the First World War, when Britain's naval dominance was challenged by German U-boat operations. The structure demonstrates the practical engineering solutions deployed to safeguard British waters during a period of unprecedented maritime threat.
Cloch Lighthouse, anti-submarine tethering points 15m N and 10m SW of is a scheduled monument protected by Historic Environment Scotland under reference SM12802. View the official record →
Cloch Lighthouse Anti-submarine Tethering Points is a pair of First World War naval installations located in Scotland. It is designated a Scheduled Ancient Monument by Historic Environment Scotland under reference SM12802.
Cloch Lighthouse, anti-submarine tethering points 15m N and 10m SW of is a Scheduled Ancient Monument, legally protected by Historic Environment Scotland — the body responsible for designating and safeguarding heritage sites in Scotland. The official designation reference is SM12802.
Several scheduled monuments lie within 10 km, including Cloch Lighthouse, coast battery 295m SSE of (0.3 km), Kirkbrae House, burial vault 65m ENE of (3.7 km), Overton reservoirs 1-8 and associated channels, Clyde Muirshiel Park (4.6 km).
This page is just one thread. A full Aubrey report pulls together 14 strands of Cloch Lighthouse, anti-submarine tethering points 15m N and 10m SW of's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Cloch Lighthouse, anti-submarine tethering points 15m N and 10m SW of stands on Inverclyde Group, bedrock that formed in the Osagean. The rock here is sandstone, siltstone and mudstone.