History of the Atlantic Cable & Undersea Communications from the first submarine cable of 1850 to the worldwide fiber optic network
The Atlantic Cable website is non-commercial, and its mission is to make available on line as much information as possible.
Cable samples, instruments, documents, brochures, souvenir books, photographs, family stories, all are valuable to researchers and historians.
Early Submarine Telegraphy Companies [archived copy] - detailed information on the first cables via Nova Scotia and Newfoundland
IET (formerly IEE) Archives - the archive of the (British) Institution of Engineering & Technology (The IET), which holds much material on early telegraphy, including the scrapbook of cable pioneer Jacob Brett, the papers of Sir Francis Ronalds, WF Cooke, Oliver Heaviside, and WH Preece, and a collection of drawings by EW Cooke on the 1858 Atlantic telegraph expedition. The archive website has a research guide to submarine telegraphy. Direct link to IET archives search.
The IET History of Technology Network page sometimes has information on cable-related books, websites, conferences, and exhibits.