A mysterious air base is being built on a volcanic island off Yemen that sits in one of the world’s crucial maritime chokepoints for both energy shipments and commercial cargo.

While no country has claimed the Mayun Island air base in the Bab el-Mandeb Strait, shipping traffic associated with a prior attempt to build a massive runway across the 5.6-kilometer (3.5 mile)-long island years ago links back to the United Arab Emirates.

Officials in Yemen’s internationally recognized government now say the Emiratis are behind this latest effort as well, even though the UAE announced in 2019 it was withdrawing its troops from a Saudi-led military campaign battling Yemen’s Houthi rebels.

See Also:

Genome of 35,000-year-old skull of European woman sequenced

“This does seem to be a longer-term strategic aim to establish a relatively permanent presence,” said Jeremy Binnie, the Mideast editor at the open-source intelligence company Janes who has followed construction on Mayun for years. It’s “possibly not just about the Yemen war and you’ve got to see the shipping situation as fairly key there”.

Read more: AP