| Quark Ultramarine | 199 pass. | 2021 | Marshall Islands | Brodosplit Shipyard (Split, Croatia) and Viktor Lenac Shipyard (Rijeka, Croatia) | |
| World Explorer | 200 pass. | 2019 | Madeira | WestSEA Shipyard (Viana do Castelo, Portugal) | |
| Ocean Adventurer | 132 pass. | 1975 | Bahamas | Tito Shipyard (Sremska Mitrovica, Serbia) | |
| Ocean Explorer | 162 pass. | 2021 | Bahamas | CMHI-China Merchants Heavy Industry (Haimen shipyard, Jiangsu China) |