These documents discuss luxury yachts and the most powerful ones currently available. The largest yacht is the Azzam, which is 590 feet long and can accommodate up to 36 guests. It has two MTU diesel engines that provide a top speed of over 30 knots and a range of over 7,000 nautical miles. The yacht has extensive amenities and was built for an undisclosed owner at a cost of over $600 million.