The threat of improvised, remote detonated mines was one of the dangers faced by Royal Australian Navy clearance divers in Vietnam. In 1970, Viet Cong divers secretly laid explosives near USS Meeker County in Vung Tau Harbour.
Luckily they were spotted and Australian clearance divers moved the explosives to a safer location to be more closely examined later that morning. However, the explosives unexpectedly detonated. Fortunately no vessel or people were nearby at the time.