The first attempt to lay a telegraph cable under the Atlantic between Ireland and Newfoundland was completed in 1858 but the cable failed. In 1866 two more cables were laid under the technical supervision of Sir William Thomson, later Baron Kelvin, and this time were successful.
Editors. "First Transatlantic Telegraph Cable". The Literary Encyclopedia. First published 21 June 2005
[http://www.litencyc.com/php/stopics.php?rec=true&UID=1572, accessed 30 June 2016.]