Towards the Monitoring of Dumped Munitions Threat (MODUM): A Study of Chemical Munitions Dumpsites in the Baltic Sea

This book describes the creation of a monitoring network, which can provide information about the exact locations and the environmental threats posed by chemical weapons (CW) dumpsites in the Baltic Sea region, using autonomous underwater vehicles (AUVs) and remotely operated underwater vehicles (ROVs), and utilising the existing research vessels of NATO partner institutions as launching platforms.

The dumping operations occurred shortly after World War II and included captured German munitions. Operations with munitions from the Soviet occupation zone were performed by the Soviet Navy, operations with munitions from British and American occupation zones were performed in areas outside of the Baltic Sea (Skagerrak Strait); the fate of munitions from the French occupation zone was never reported. Due to difficult legal status of these munitions, and high costs of remediation and retrieval, removal of these weapons from the bottom of the Baltic Sea seems unlikely in the foreseeable future. These dumped chemical weapons pose an actual environmental and security hazard in the Baltic Sea Region. Nowadays, with more and more industrial activities being performed in the Baltic Sea Area, the threat level is rising. 

The AUV survey is based on the IVER2 platform by OceanServer, equipped with Klein 3500 side-scan sonar. The identification phase utilises several ROVs, equipped with targeting sonars, acoustic cameras capable of penetrating turbid bottom waters up to 20m, and visual HD cameras. A novel sediment sampling system, based on a camera and sonar equipped cassette sampler, has been developed to obtain surface sediments. The test phase described consists of a survey phase, which will locate the actual objects concerned, and a monitoring phase, which will concentrate on the collection of environmental data close to the objects concerned.