What is Undersea cable?
An '''undersea cable''' or '''submarine communications cable''' is a [[cable]] that is laid in the [[sea]] or in [[waterway]]s. Usually such cables either carry [[electricity]] or they are used for [[telecommunication]]. Cables longer than about {{convert|70|km}} use [[direct current]], because the loss is too big with [[alternating current]]. Such cables are also built in a very rugged way. {{tech-stub}} [[Category:Technology]]