heavy equipment working in water enviroment

Hello I'm student on technical university. I'm looking for help in writing an article about heavy equipment working in water enviroment, like amphibious excavators, underwater dozers or dreging equipment. What I exacly looking for is any kind of articles in professional press, or maybe anyone know any books about this issue? In this moment I find some informations about: -The Amphibex -Knoop Machinery B.V -UltraTrex -Boramtech -Wilco -Marsh Buggies -John Deere -Komatsu (my favourite D155W) But there is only catalog informations. I need something more.