A military structure located at coordinates 49.6840°N, 1.4746°W in the Normandy region of France, near the commune of Saint-Martin-du-Bec. The site is situated in a rural, hilly area approximately 10 kilometers from the English Channel coast. The region saw significant military activity during World War II, particularly during the Normandy landings and subsequent operations, but the specific purpose and history of this particular structure are not confirmed by available sources.
The designation '502a' suggests it may be part of a numbered series of fortifications or installations, though its exact origin and function remain unverified. Current condition and accessibility are unknown.