Soren is known in archaeology primarily for three discoveries. His archaeological excavations at Kourion, Cyprus were designed to identify the epicenter of the famous Mediterranean earthquake of July 21, 365 A.D. He located the epicenter of this mega-disaster offshore approximately 25 miles southwest of the town of Kourion. Brian Fagan described this discovery as one of the 50 most significant in world archaeology. His second discovery was the identification of "Plasmodium falciparum" malaria as a significant contributor to the downfall of the Roman Empire. This was done through analysis of DNA of infant bones from a cemetery he excavated at Lugnano in Teverina, Umbria between 1987 and 1991 – the first such use of DNA evidence on an archaeological site. The third discovery was the site of the famous Roman "fontes Clusini" or Springs of Chiusi, a healing sanctuary featuring a cold water spring said by the poet Horace in his "Epistles" to have cured the gravely ill emperor Augustus from his stomach pains in 23 B.C. Soren discovered the largest cold water ancient spring and sanctuary in Italy, near Chiusi in the Tuscan town of Chianciano Terme. The ancient spring he found was still flowing and the water contained large amounts of calcium sulfate which functions as a strong laxative.