From Channel cables to transatlantic communications

How did the idea of laying submarine telegraph cables across the Atlantic develop?

Short experimental links across the English Channel proved the method, companies improved insulated cable construction, and commercial demand drove expansion toward transatlantic and imperial routes.

The first short Channel links in 1850 and 1851 proved that an insulated telegraph cable could work underwater. Copper wire protected with gutta-percha gave the early lines their essential insulation. The Submarine Telegraph Company then expanded the network, while transatlantic attempts followed in 1858 and succeeded more durably in the mid-1860s. Persistent demand for faster information turned a short experimental route into an ocean-spanning communications system.