Black Holt former Atomic Bomb Store: Component Testing Building

The Black Holt former Atomic Bomb Store's Component Testing Building is a mounded and reinforced concrete structure dating from the 1950s. It is constructed from reinforced concrete, painted brick, earth, and turf.

The building is semi-buried beneath a large earth mound, with a roughly rectangular interior space divided into three main sections. The exterior is largely obscured by the earthen mound, and access to the main space is from the north via a track leading to a timber boarded double leaf door with a wicket.

Inside, an unburied section features top lighting from profiled sheet roofing, and the walls are made of painted brick. The interior is divided by a spine wall with flat-headed openings. Beyond this wall is the buried section, which contains test bays at the rear, separated by brick columns with corbelled capitals that support deep steel beams in an I profile. A hydrometer is located in the end bay, and an office is situated at the north end of the building.