2018, 20.7 million barrels per day were transported through the strait. The choke point has undergone continuous unrest since the 1980s. This includes, the downing of Iran Air Flight 655 by an American surface-to-air missile in 1988, the collision between nuclear submarine USS Newport News and crude tanker Mogamigawa in 2007, U.S.–Iranian naval dispute in 2008 and 2011–2012, seizure of MV Maersk Tigris in 2015 and threats of a strait closure in 2018 and 2019 made by the Islamic Republic of Iran. Most recently, in April 2020, statements from Iran's military shows its readiness to defend its territorial integrity. The Suez Canal and the Sumed pipeline carry a day, and the canal carried a total of 7.5% of world trade in 2011. The canal was closed for eight years after the Six-Day War in 1967. In many instances, alternate routes are nonexistent or impractical. For example, an alternate to the Suez/Sumed route required an additional around Cape of Good Hope. The Royal Navy also still deems its choke points to the Atlantic as strategically important. Threats to the Strait of Hormuz The Strait of Hormuz, connecting the Persian Gulf and Arabian Sea, is one of the world's most strategically important maritime choke points. The Islamic Republic of Iran is one of the largest security threats in the Strait of Hormuz and remains an essential factor in global energy security, due to the high volume of oil and natural gas passing through the narrow openings on a daily basis. The sovereignty of The Islamic Republic of Iran extends, beyond its land territory, internal waters and its islands in the Persian Gulf, the Strait of Hormuz and the Oman Sea. Iran has used its sovereignty to threaten to close down the Strait of Hormuz multiple times, due to sanctions imposed on the country. This aposes serious threats to the global oil market, with the Strait of Hormuz as a key location. Iran's capabilities are found in the country's anti-access/area denial capabilities including small attack craft equipped with machine guns, multiple-launch rockets, anti-ship missiles and torpedoes. Naval mining has also been used as a strategy to threaten the security of the Strait of Hormuz. Lastly, the many naval exercises and unconventional methods used by the Islamic Republic of Iran Navy, is a display of capability and shows readiness to take action in the choke point. The strategic value of maritime choke points such