Submarine Cables or Submarine Communications Cables were first developed in the 1850s to carry telegraphy information cables laid on the sea bed with the purpose of connecting stations on land.
Modern cables use optic fibre technology to carry telephone, internet (including email) and even encrypted data.
For extra information the submarine cable connecting the United States to Europe is known as MAREA. It is 6600 km long and connects the United States to Spain.
