In the past, workers who were inside a vessel below ground or below sea level had to climb to use a phone or walkie talkie when they had to talk to somcone about a problem. The new wireless network is connected to the electric lines in the ship, which convey digital data to Wi-Fi wireless transmitters placed around the hull during construction. Workers' Internet phones, webcams, and PCs are linked to the Wi-Fi system, so workers can use Skype VoIP to call their colleagues on the sur face. Designers in an office building a mile from the con struction site use the webcams to investigate problems. On the shipyard roads, 30 trans- porter trucks fitted to receivers connected to the wireless net- work update their location every 20 seconds to a control room. This helps dispatchers