From 2016, SwAM has the responsibility to coordinate investigations and recovery operations of oil and ghost nets from shipwrecks. SwAM leads a national working group on risk assessment and remediation of wrecks. The group includes the Swedish Maritime Administration, the Swedish Coast Guard, the Swedish National Maritime Museums, The Swedish Navy and Chalmers University of Technology. The Swedish Maritime Administration makes hydrographic surveys with side scan and multibeam sonar to control the status and location of the shipwrecks (multibeam sonar sends out multiple audio signals that hit the shipwreck and bounce back, a three-dimensional image of the wreck can then be created in a computer). The Swedish Coast Guard and the Swedish Navy dive and film the shipwrecks to obtain more detailed data and to assist in evaluating the environmental risk they pose. The Swedish National Maritime Museums assists with gathering the history regarding the shipwrecks and Chalmers University of Technology contribute with the development of the risk assessment tool VRAKA (probabilistic risk assessment of shipwrecks).