L 411a Searchlight Bunker
This is unusual for a couple of reasons, the first being is that all the original doors are there intact. This is unusual because in 1953 there was a scrap metal drive where all the occupation structures were stripped of everything metal. Even though the metalwork was spared, the timber boarding which would have covered all the walls for insulation has been removed.
The second thing which makes this bunker unusual is that it was constructed as a Type L 411a, which is an airforce design which contained an Army searchlight. The standard army design is the Type 606.
During the war there were 57 searchlight shelters planned for Jersey, and only 7 of those were built to fortress standards, 6 being Type 606 and this one being Type L411a.