These metallic shapes with rust, sea anemones and barnacles are what is left of the Steam Ship Falcon, that caught fire in 1926 and ended wrecked in Dover coast, in front of the Langdon search lights, precisely.
Little remains of that ship but its steel frame is still there. The pass of time has created its own biological ecosystem in the old structure. Rocks and stones have engulfed the steel, integrating this man-made object in the stone floor. This structures are only visible with low tides. There is even a film from the event. Silent and in black and white, of course:
And this is how the remains look from the edge of the cliff. It is amazing how these shipwrecks look when enough time passes.