Phoenix breakwaters

They were collected at Dungeness and Selsey, and then towed by tugboats across the English Channel and sunk to form the Mulberry harbour breakwaters replacing the initial "Gooseberry" block ships.

[1] Caissons were added in the autumn of 1944 to reinforce the existing structure to cope with the harbour continuing in use longer than planned.

[1] A wrecked Phoenix breakwater is also to be seen, broken in two, in the Thames estuary off Shoeburyness in Essex.

It is not quite covered at high tide, but it is topped by a beacon to warn shipping of its presence.

Raised from Arromanches, they were initially towed to Frihamnen port in Stockholm and moved on 20 September 1956 to the newly-built heat and power plant in Hässelby where they remain as of 2021.