A flexible, tubular explosive device consisting of a core of high explosives – usually PETN (pentaerythritol tetranitrate) or RDX (cyclotrimethylenetrinitramine) – encased in a waterproof outer covering. Det cord rapidly transmits a detonation wave along its length with high velocity for applications where precise and controlled initiation of explosive materials is required, such as in demolition, quarrying, and military operations. It is ideal for initiating large charges of high explosives simultaneously or in situations where conventional detonators may not be suitable. Det cord is highly regulated, requiring specialised training for handling and use.