I read a book from 1896, Wilkinson's Submarine Cable Laying and Repairing. I was pretty impressed with the complicated grapnels they had back then--capable of scooping up a delicate cable, slicing the cable as appropriate. I was so impressed that I typed up the grapnel chapter, scanning in the illustrations: http://lahosken.san-francisco.ca.us/frivolity/wilk inson/I_3.html