(Photo by polky yu)

A YouTube video emerged on May 18, 2018, showing a Saudi C-130H flying very low over a soldier's head in Yemen, The War Zone first reported.

The video appears to show the soldier trying to slap the underside of the C-130H with an article of clothing, but it's unclear where exactly in Yemen it was shot, and how much of it was planned, The War Zone reported.

C-130s are large transport aircraft, which are vital to Saudi Arabia's operations in Yemen, The War Zone reported. Part of a $110 arms deal, the US sold Riyadh 20 C-130Js and three KC-130 refuelers in 2017 for $5.8 billion.

Watch the video below:

The conflict in Yemen has been described as one of the worst humanitarian disasters in the world, with at least 8 million people on the brink of starvation due to famine, and one million children infected with cholera.

The Saudi-led coalition began striking the Shiite Muslim Houthis in 2015 after the Houthis overthrew the government of President Abdu Rabbu Mansour Hadi from the Yemeni capital of Sanaa.

The Saudi-led coalition has since been accused of conducting indiscriminate and unlawful airstrikes, as well as blocking food, fuel, and medicine into the country, according to Human Rights Watch. A number of countries are part of the Saudi-led coalition, including the US, but Saudi Arabia and the UAE are the main actors conducting airstrikes in the war-torn country.

At the same time, the Houthis have repeatedly fired artillery at Yemeni cities, missiles at Saudi Arabia, been accused of using child soldiers, and more.

In late January 2018, Germany and Norway announced that they would stop selling weapons to countries in the Saudi-led coalition over the war in Yemen.

This article originally appeared on Business Insider. Follow @BusinessInsider on Twitter.