Transatlantic telegraph cable 海底电缆
![The Telegraph Field,[7] Valentia Island, Ireland, the site of the earliest message sent from Ireland to North America. In October 2002, a memorial to mark the laying of the transatlantic cable to Newfoundland was unveiled on top of Foilhomerrum Cliff. Made of Valentia slate and designed by local sculptor Alan Hall,[8] the memorial marks the history of the telegraph industry to the island from 1857 forward.](/uploads/202502/17/Irl-ValentiaTelegraph4343.jpg)
A transatlantic telegraph cable is an undersea cable running under the Atlantic Ocean used for telegraph communications. The first was laid across the floor of the Atlantic from Telegraph Field, Foilhommerum Bay, Valentia Island in western Ireland to Heart's Content in eastern Newfoundland. The first communications occurred August 16, 1858, reducing the communication time between North America and Europe from ten days – the time it took to deliver a message by ship – to a much shorter time. Transatlantic telegraph cables have been replaced by transatlantic telecommunications cables.