Rescuers were searching a Moroccan hillside lake for the boss of the world’s largest sovereign fund, the Abu Dhabi Investment Authority, two days after his plane crashed into it.

The pilot was rescued but Sheik Ahmed bin Zayed Al Nahayan, the younger brother of the ruler of Abu Dhabi, who is also president of the United Arab Emirates, was reported as missing.

Sheik Ahmed’s fund is believed to have assets of around $500 billion to $700 billion.