Underwater cables are specialized cables laid on the ocean floor to transmit data and electricity between countries and continents. These cables are essential for global communication, as they carry the majority of the world's internet traffic, connecting various telecommunication networks and data centers. Typically made of multiple layers for protection, underwater cables can stretch thousands of miles. They are installed using specialized ships that carefully lay the cables to avoid damage from ocean currents and marine life. Maintenance and repairs are crucial to ensure uninterrupted service, making these cables vital for modern connectivity.