Saudi crude exports from the Red Sea are increasingly vanishing from view as tankers switch off tracking signals to avoid attacks by Yemen's Iran-aligned Houthis, with analysts saying all recent Yanbu loadings have been conducted "dark". The growing use of so-called dark voyages is clouding visibility into Saudi oil exports, making it harder to assess the degree to which the Houthi threats may be disrupting crude flows. "Last week Yanbu liftings were all conducted dark. Shipping traffic through the Bab al-Mandeb Strait at the southern tip of the Red Sea had already been affected by two years of sporadic Houthi attacks on commercial shipping. Major tanker operator DHT previously exited the Red Sea via Bab al-Mandeb when lifting oil.