Captain John Lort Stokes later renamed Milford Haven as Milford Sound. Following the passage of the Ngāi Tahu Claims Settlement Act 1998, the name of the fiord was officially altered to Milford Sound / Piopiotahi. While Fiordland as such remained one of the least-explored areas of New Zealand up to the 20th century, Milford Sound's natural beauty soon attracted national and international renown, and led to the discovery of the McKinnon Pass in 1888, soon to become a part of the new Milford Track, an early walking tourism trail. In the same year, the low watershed saddle between the Hollyford River and the Cleddau River was discovered, where the Homer Tunnel was to be developed about sixty years later to provide road access. As of the 2006 census, just 120 people lived in Milford Sound, most of them working in tourism or conservation. Tourism Overview Milford Sound attracts between 550,000 and 1 million visitors per year. This makes the sound one of New Zealand's most-visited tourist spots even with its remote location and long journey times from the nearest population centres. Many tourists take one of the boat tours which usually last one to two hours. They are offered by several companies, departing from the Milford Sound Visitors' Centre. Tramping, canoeing, and some other water sports are possible. A small number of companies also provide overnight boat trips. There is otherwise only limited accommodation at the sound, and only a very small percentage of tourists stay more than the day. Tourists usually stay in Te Anau or Queenstown. The Milford Discovery Centre & Underwater Observatory is located in Harrisons Cove on the north side of the fiord. Situated within the Piopiotahi Marine Reserve, the underwater observatory allows visitors to view the fiord's unique marine environment at a depth of 10 metres. Due to a natural phenomenon called 'deep water emergence,' deep-water animals such as black coral can be viewed in the shallow waters surrounding the observatory. A dark surface layer of fresh water, stained brown by tannins from the surrounding forest, along with cold water temperatures allow the black corals to grow close to the surface throughout Milford Sound and Fiordland. Milford Sound is also a destination for cruise ships. Transport By road, Milford Sound is from Queenstown and from Invercargill (about four hours' drive), with most of the tour buses to the sound departing from Queenstown. Some tourists also