`` out of a mix of sites and discussion groups , our sys progs found the deep divers clustered on the following category topics : aarhus , denmark argon/oxygen drives australian military history caisson seawalls cavitation ( solid ) cellular encryption controlled demolition flood mitigation high-voltage insulators hilo , hawaii mid-ocean relay network ( morn ) missionary diaries of the pacific national earthquake information center ( neic ) national environmental resource fund ( nerf ) network data encryption potassium hydroxide prescott , arizona rain forest disease foundation ( rfdf ) seismic signatures , geological shaped explosives ( timed ) shinkai 2000 solid rocket propellant mixtures toxins and neurotoxins wire-guided projectiles `` an impressive , if mysterious list , '' hitomi said .