The 3,500-ear-old city was revealed by a team of Austrian archaeologists using radar. Such imaging technology is increasingly being used for archaeological efforts.
"Egypt was ruled for a century from 1664-1569 BC by the Hyksos, a group of warriors from Asia – possibly Semitic in origin – whose summer capital, Avaris, was in the northern Delta area.
Irene Müller, the head of the Austrian team, said the main purpose of the project was to determine how far the underground city extends. The radar imaging showed the outlines of streets, houses and temples underneath the green farm fields and modern town of Tel al-Dabaa."