An 1866 lithograph by Robert Dudley shows the HMS Agamemnon, one of the first ships to attempt to lay a transatlantic telegraph cable, dwarfed by the SS Great Eastern, the ship that eventually accomplished the task, and the first one large enough to carry the entire cable length by itself.
The story here: A Wire Across the Ocean - The first telegraph cable to span the Atlantic revolutionized communication, but it also transformed business, politics, and even language.