A British military technology firm (BAE) has developed a wireless communications system with a signal that can pass through several inches (over 7 cm) of steel. This is important for submarines, where current construction methods require over 200 extra expensive pressure hull penetrations for each boat. The new wireless system saves hundreds of millions of dollars, and makes the boats safer. The new wireless tech also helps in constructing surface ships, but not as much as for subs. The tech is also useful for armored vehicles, and in many civilian applications.