Good link: http://www.tdisdi.com/index.php?did=16&site=4 The actual courses are adaptable in terms of environment but start with a core foundation. A big aspect of PSD is alsoin terms of evidence recovery, chain of custody of the evidence and providing court testimony. (another great link via one of the members of the VA State Police Dive Team http://www.ucidiver.com/ ) Different teams have different goals, resources, conditions, skill sets to deal with depending on what best serves the public. There is no short answer to your question, but feel free to send me a message if I can provide additional information for you.