DL-12T decoy launcher and Loki torpedo countermeasure systems. Butyrylcholinesterase is a prophylactic countermeasure against organophosphate nerve agents. It is primarily intended as a countermeasure to passive monitoring. Image processing is an alternative crosstalk countermeasure. The integrated Triple DES authentication provides an effective countermeasure against cloning. Inc. advertised Lysol disinfectant as an effective countermeasure to the influenza virus. Tracers proved useful as a countermeasure against Zeppelins used by Germany during World War I. An unspecified electronic countermeasure (ECM) system was also fitted to counter IEDs. The results of this experiment support echolocation distortion as an effective countermeasure. The main countermeasure the submarine has is stealth; it tries not to be detected. In 2020, UVGI is again being researched as a possible countermeasure against the COVID-19 pandemic. The fourth bomb bay carried electronic countermeasure equipment. Other NBC defenses include a "countermeasure wash down system". However, the most effective countermeasure was the convoy. Attempts to rescind this order fail because a new Soviet countermeasure jams American radio communications.