The book "Paulmann-Blaum: The Excavators and Excavator Auxiliary Equipment, I Hydraulic Excavators," was published in its second edition in 1923. In the decades that have passed since then, the hulls of the ships and the tools of the floating excavators have not changed significantly, although the machinery has evolved with the introduction of different types of propulsion compared to the steam engines that were still commonly used at that time. Most importantly, it became clear that soil mechanics, tailored specifically for dredging in water, is of crucial importance. The preliminary work for this new edition was initiated soon after the last war independently by R. Blaum and the author, and continued in collaboration until R. Blaum's passing in 1955. The material he left behind.