Fort Ricasoli Sound Locator was built on the Southern ramparts of the main fort. It is of similar basic design to the other locators, but is much more crudely built.
The locator pen presently has vertical walls, although they may have had concave corrugated iron in the past. The centre of the pen has later be used for radio masts.
The searchlight position lies along the ramparts, but not a great deal has survived. This section of Fort Ricasoli has recently been restored and it is not know how this unique structure has faired.