Yacht support vessels have become an increasingly popular way for yacht owners to elevate the experience of owning and being onboard a yacht. They can be used as a tender garage to store more tenders and toys, as a helipad for adventures further out, or as accommodation for additional crew and specialist staff. SYT takes a look at the world’s largest yacht support vessels currently in operation.OK | Oshima Shipyard | 1982 | 146-metres

Karmarine Shipyard completed the transformation of the 1982 semi-submersible support yacht, previously known as AS Super Servant 3, in January 2022. OK can be described as both a support yacht and a  “world-girdling” expedition motor yacht. OK was originally built by Oshima Shipbuilding and features an exterior style by Bozca Design. The 146-metre vessel boasts an impressive 3,300 square-metres of open space on her aft deck and is able to provide accommodation for 70 different toys, including a 46-metre sailing yacht, multiple tenders, buggies, amphibious vehicles and a sea plane. OK can also accommodate up to 20 guests and includes a glass-wrapped sun deck Jacuzzi, an outdoor cinema, a tennis court, a botanic garden and four large aquariums. Photo: Charl van RooyM2 | Severnav | 2002 | 130.2-metres

The 130.2-metre Severnav support yacht M2 was delivered in 2002 from Romania. The 7,404 GT vessel, previously named Aranui III, operated as a dual passenger/cargo vessel between Tahiti and the Marquesas Islands before she…