A multi-sensory underwater space? It sounds like the latest in wellness spa salons but imagine such a subterranean nook aboard a cruise ship. Frenchowned luxury line Ponant is launching a sub-aquatic passenger lounge, known as Blue Eye, aboard its 92cabin expedition ship Le Laperouse, which will have its maiden voyage next year. Armchair adventurers will be able to view photo-luminescent organisms and marine creatures through portholes shaped like the eye of a cetacean and watch digital images, such as dolphins riding bow waves, filmed live by three underwater cameras. Hydrophones have been integrated beneath the keel so there’s an underwater symphony to complete the immersive effect. Le Laperouse’s sister ship, Le Champlain, will also be fitted with the Blue Eye concept in 2018, followed by Le Bougainville and Le Dumont-D’Urville in 2019. Le Laperouse will operate from mid-2018, with two seven-night Icelandic Mosaic round-cruises departing June 19 or June 26 from Reykjavik and including a crossing of the Arctic Circle. From $6740 a person. More: ponant.com.