Israel's Prime Minister Netanyahu attends a ceremony at a naval base in Haifa

Israel's Prime Minister Benjamin Netanyahu (C), military chief Lieutenant-General Benny Gantz (2nd L) and Defence Minister Moshe Yaalon (2nd R) attend a ceremony upon the arrival of INS Tanin, a Dolphin AIP class submarine, at a naval base in the northern city of Haifa September 23, 2014. Tanin is the fourth submarine Israel has acquired, and is the first of three German-built Dolphin AIP class vessels ordered by Israel, an Israeli Defence Forces spokesperson said on Tuesday. UPI/Amir Cohen/Pool