carried out with minimal support from the IAF (only one Arab naval target was destroyed from the air during the entire war). The Egyptian Navy managed to enforce a blockade at Bab-el-Mandeb. Eighteen million tons of oil had been transported yearly from Iran to Israel through the straits of Bab-el-Mandeb. The blockade was enforced by two Egyptian destroyers and two submarines, supported by ancillary craft. Shipping destined for Israel through the Gulf of Eilat was halted by the Egyptians. The Israeli Navy had no means of lifting the blockade due to the long range involved, and the Israeli Air Force, apparently also incapable of lifting the blockade, did not challenge it. The blockade was lifted on November 1, after Israel used the surrounded Egyptian Third Army as a bargaining chip. The Egyptians unsuccessfully attempted to blockade the Israeli Mediterranean coastline, and mined the Gulf of Suez to prevent the transportation of oil from the Bala'eem and Abu Rudeis oil fields in southwestern Sinai to Eilat in southern Israel. Two oil tankers, of 48,000 ton and 2,000 ton capacity, sank after hitting mines in the Gulf. According to Admiral Ze'ev Almog, the Israeli Navy escorted tankers from the Gulf to Eilat throughout the war, and Israeli tankers sailing from Iran were directed to bypass the Red Sea. As a result of these actions and the failure of Egypt's Mediterranean blockade, the transport of oil, grain and weapons to Israeli ports was made possible throughout nearly the entire war. A post-war survey found that during the entire war period, Israel suffered no oil shortages, and even sold oil to third parties affected by the Arab oil embargo. This claim was disputed by Edgar O'Ballance, who claimed that no oil went to Israel during the blockade, and the Eilat-Ashdod pipeline was empty by the end of the war. Israel responded with a counter-blockade of Egypt in the Gulf of Suez. The Israeli blockade was enforced by naval vessels based at Sharm el-Sheikh and on the Sinai coast facing the Gulf of Suez. The Israeli blockade substantially damaged the Egyptian economy. According to historian Gammal Hammad, Egypt's principal ports, Alexandria and Port Safaga, remained open to shipping throughout the war. Throughout the war, the Israeli Navy enjoyed complete command of the seas both in the Mediterranean approaches and in the Gulf of Suez. During the last week of the war, Egyptian frogmen carried out