Duration Duration: 45-60mins

Hidden under the surface in Harrison Cove is a unique and beautiful environment – there’s nowhere else in the world quite like it. In the middle of Piopiotahi Marine Reserve, the Underwater Observatory enables you to experience the magic of this special world, previously the exclusive realm of divers.

Descend 64 steps (10 metres) underwater into a large, fully air conditioned viewing area where large windows with excellent optical clarity open your eyes to this deep underwater haven. Unlike an aquarium, the fish are free to come and go; it’s the people who are contained.

Why visit the Milford Sound Underwater Observatory?

  • New Zealand’s only floating underwater observatory is a unique, interacting learning experience
  • Be guided through the Milford Sound story on colourful information panels covering culture, heritage, history, geology and wildlife
  • Watch dramatic Milford Road and Homer Tunnel avalanche videos
  • Immerse yourself in a mysterious undersea world and encounter the extraordinary rare black coral and colourful sea creatures teeming just below the surface
  • Thanks to its unique underwater environment, Milford Sound is home to species of black coral usually found at depths of more than 500 metres

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How to book the Milford Sound Underwater Observatory

Add on to any of our cruises, except the last cruise of the day. Entry is included on our Discover More experience. Please allow an additional 45-60 minutes.

Choose to experience it all with our Milford Sound Cruise & Kayak package or add on to any of the cruises below, when you book.


Cruise Adult Child  
Discover More Cruise Included Included book
Encounter Nature Cruise add on $25 add on $15 book
Scenic Cruise add on $25 add on $15 book
Nature Cruise add on $25 add on $15 book

See full cruise timetable here

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