Adding to Russian billionaire Roman Abramovich's private fleet of luxury yachts is the new 'gigayacht' Eclipse, which is regarded as the world's most expensive private yacht.

Built by Germany's Blohm + Voss, the yacht's interiors and exteriors are designed by Terence Disdale Design and its naval architect is Francis design.

The $500 million plus yacht, which measures anywhere from 533 ft. to 557 ft., is reported as the world's largest privately owned yacht. With private space for 75 official crew and 30 guests, the Eclipse features two helicopter pads, two swimming pools, several hot tubs and a disco hall.

The yacht is also equipped with three launch boats and a small submarine that is capable of submerging to 50 meters. In addition, it features a well-equipped military-grade missile defense system. Also, the windows in Abramovich's master suite and the yacht's bridge are fitted with bullet-proof glass and both are armor plated.

Eclipse was launched on June 2009 and arrived in Frederikshavn, Denmark on September 2009 for tests, and finally delivered to Abramovich on December 9, 2010. The yacht is now navigating towards the Caribbean where her owner can enjoy her in the sun.