OKKO is a 41.10m Mondomarine from 2013. Exterior and interior design are by Giorgio Vafiadis. At 366 GT she is a high-volume semi-displacement yacht built in aluminium, classed with ABS for commercial yachting service and flying the Maltese flag.

She accommodates up to 12 guests in 5 cabins. The full-beam owner's stateroom with dressing area and en-suite bathroom is located forward on the main deck. Two VIP cabins and two twin cabins are on the lower deck, each with en-suite bathroom and the twins with an additional Pullman berth. There is accommodation for seven crew including the captain.

Life on deck centres on the sun deck with elevated jacuzzi, bar, barbecue, sun pads and lounge seating. The upper deck offers a round dining table and a sofa area aft, a sky lounge with panoramic views and a forward area with sun pads and an outdoor gym. The main deck aft has a further dining and lounge area with bar, leading into the main salon with formal dining. The stern houses a hydraulic swim platform and the tender garage. Twin MTU 12V 2000 M91 engines of 1,119 kW each give a top speed of 16 knots, a cruising speed of 12 knots and a range of 3,000 nautical miles at 12 knots, with a fuel consumption of 250 l/h at cruising speed. Naiad zero-speed stabilisers work under way and at anchor. Extensive engine room, propulsion and steering works were carried out in 2022–2023, followed by technical, IT and interior upgrades in 2024–2025. The main engines show around 4,950 hours as of January 2026. The tender is a Castoldi Jet Tender 17, the toys include two Sea-Doo jet skis and two Seabobs. OKKO has a successful charter track record with 70 charter days in 2024 and 81 in 2025.