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She said she "didn't realise" he had pulled her down to the bottom of the groynes near the sea at about 23:30 BST, where he forced her down.

"As far as I'm aware, those train tracks were built in 1973 to support the building of the coast protection structures - the timber revetments which go along the cliffs, but also the groynes," he said.

Additionally, the reduction in flow between the groynes could potentially benefit the stability of the intertidal coastal areas in the long term and mitigate the effects of rising sea levels.

The machinery was being used to replace groynes as part of a scheme by BCP Council to protect the beach from erosion.

The groyne replacement is part of a 17-year beach management scheme, which started in 2015, to help protect the coastline from flooding and erosion.