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Marsworth Airfield (10) - Entrance to shelter

These ruinous walls are what remain of the entrance to an underground shelter, to be used in the event of an attack on the airfield. The maze-like construction of the walls was intended to prevent, or at least reduce, the blast from exploding bombs from penetrating the sanctuary of the shelter. There are a number of these shelters dotted about the airfield for obvious reasons - i.e. so personnel could dive for cover in the nearest one. Another example can be seen in SP9115 : Marsworth Airfield (9) - Dug-out beside Nissen Hut.
The next photo in the sequence can be seen SP9115 : Marsworth Airfield (11) - Parachute Store

* Please Note: This former airfield is a private site and permission is required to gain access *

General comments common to all photos in this sequence:
This old airfield is known by several names, such as RAF Cheddington, RAF Marsworth, Cheddington Airfield etc. I am using Marsworth Airfield as the title throughout this series of photos as that is probably its commonest name nowadays.
The airfield opened in March 1942 as RAF Cheddington, a satellite airfield to Wing. Wellington Bombers flew training missions out of here under the auspices of 26 Operational Training Unit. In September 1942 control of the airfield was passed to the US Army Airforce (USAAF). As a result the airfield became home to the B-24 Liberators of three squadrons (66th, 67th & 68th) of the Eighth Airforce 44th Bombardment Group. Quite soon however these squadrons were moved to Norfolk, and the RAFs 26th OTU returned. More training missions were flown from here during early 1943, and then in August of that year the US 8th Airforce returned, becoming Station 113. During 1944 several Bombardment squadrons flew special missions over Europe using mainly B24 Liberators, but also some B17 Flying Fortresses. These specials missions mostly involved leaflet drops, and document drops (such as fake ration books to disrupt the enemy's economy), but also involved early electronic warfare jamming RADAR and creating false signals etc.
The airfield passed to the British Army once the War was over, and closed in 1952 since when it has mostly slowly decayed, though some of the buildings are used for small industrial purposes, and the northern end of the airfield nearer Cheddington is home to some newer industrial units.