1 - AZZAM

Owner: Khalifa Al Nahyan
Profession: President of the United Arab Emirates
Cost: $600 million
Length: 180 m (590.6 feet)
Maximum speed: 30 knots
Crew members: 50
Technology
Much of the technology of this superyacht is kept secret. Nevertheless, it is equipped with environmentally friendly technology: reduction of carbon dioxide, reduction of noise and soot emissions, improvement of energy efficiency. Finally, it is equipped with installations that use the residual heat from the engine to operate the yacht's watermaker for drinking water.
2 - ECLIPSE

Owner: Roman Abramovich
Occupation: Russian Businessman
Cost: $500 million
Length: 162.50 m (281.11 feet)
Maximum speed: 25 knots
Crew members: 70
Technology
The ship has been designed bomb-proof and in case of attacks, there are 5 possible exits. It also has a missile defence system. It is equipped with a floating interior port and can accommodate 3 ultra-fast tenders. Finally, it is equipped with an anti paparazzi system that prevents the taking of pictures.
3 - YAS

Owner: Hamdan bin Zayed bin Sultan Al Nahyan
Profession: Politician and member of the Emirati royalty
Cost: unknown, but estimated at $350 million
Length: 141 m (426.7 feet)
Maximum speed: 26 knots
Crew members: 56
Technology
Its security system is based on the Ministry of Defence frigates. The doors were made of carbon fibre to reduce the total weight of the boat. It is equipped with an ecological diesel engine that reduces the boat's ecological footprint. Other technological gadgets include SATCOM (satellite communication system), long-range underwater sonar, and a night navigation system (high resolution thermal image, night vision camera...).
4 ? A

Owner: Andrey Melnichenko
Occupation: Russian Businessman
Cost: $323 million
Length: 119 m (390.5 feet)
Maximum speed: 23 knots
Crew members: 42
Technology
It is the largest yacht designed with an inverted bow, which allows it to sail through icebergs. It has been totally customized in terms of security. The windows are bomb-proof, the yacht is equipped with more than 40 video surveillance cameras, motion detectors, spaces secured by biometric fingerprints and has an emergency escape pod.
5 - AL SAID

Owner: Sultan Qaboos
Occupation: Sultan of Oman
Cost: $300 million
Length: 155 m (390.5 feet)
Maximum speed: 25 knots
Crew members: 154
Technology
It is equipped with anchoring stabilizers that allow the greatest comfort on board at anchor and on rough seas. It has 2 diesel engines MTU 10 988 hp. This yacht is surrounded by mystery and the guests must by helicopter and no one, with the exception of the Sultan's court, could see inside the boat.