By Frank Gardner, safety correspondent and Malu CursinoBBC News

The US says it carried out a recent assault towards a Houthi goal in Yemen on Saturday – its second such strike on the group in two days.
The operation was described by the US as a “follow-on motion” concentrating on a Houthi radar website.
The Houthis vowed a “robust and efficient response”, including that there have been no accidents.
The strikes come after weeks of assaults by Houthis on business transport within the Red Sea.
Joint UK-US airstrikes focused almost 30 Houthi positions within the early hours of Friday with the help of Western allies together with Australia and Canada.
A day later, the US Central Command mentioned it carried out its newest strike on a Houthi radar website in Yemen utilizing Tomahawk land assault cruise missiles.
The strike towards a “particular navy goal” was designed to “degrade the Houthi’s potential to assault maritime vessels”, it added.


About 15% of worldwide seaborne commerce passes by means of the Red Sea, the US says. This consists of 8% of worldwide grain, 12% of seaborne oil and eight% of the world’s liquefied pure fuel.
The US says the group has up to now tried to assault and harass vessels within the Red Sea and the Gulf of Aden 28 occasions.
Some main transport firms have since ceased operations within the area, whereas insurance coverage prices have risen 10 occasions since early December.
The Houthis are an armed group from a sub-sect of Yemen’s Shia Muslim minority, the Zaidis. They take their identify from the motion’s founder, Hussein al-Houthi.
The official authorities of Yemen is the Presidential Leadership Council, to which President Abdrabbuh Mansour Hadi transferred his powers in April 2022. It is predicated within the Saudi capital Riyadh, after Mr. Hadi fled there in 2015.
Most of the Yemeni inhabitants lives in areas underneath Houthi management. As effectively as Sanaa and the north of Yemen, the Houthis management the Red Sea shoreline.