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2. Dive light - Wikipedia

   en.wikipedia.org/wiki/Dive_light

   Backup lights are carried in case the primary light fails during the dive. This is particularly important in cave and wreck penetration diving, where the light is required to facilitate navigation out of the enclosed space. Cave divers are trained to carry three dive lights as a result of an accident analysis by Sheck Exley published in 1977 ...

3. Michigan Underwater Preserves - Wikipedia

   en.wikipedia.org/wiki/Michigan_Underwater_Preserves

   Michigan Underwater Preserves. Michigan Underwater Preserves or Michigan Bottomland Preserves are protected areas of the Great Lakes on Michigan's coast. The thirteen designated areas, comprising a surface area of over 7,000 square miles (18,000 km 2), are considered to be "Underwater museums" and serve to protect concentrations of shipwrecks, unique geologic features and other submerged sites ...

4. Grand Haven South Pierhead Entrance Light - Wikipedia

   en.wikipedia.org/wiki/Grand_Haven_South_Pierhead...

   Grand Haven South Pierhead Entrance Light is the outer light of two lighthouses on the south pier of Grand Haven, Michigan where the Grand River enters Lake Michigan. A lighthouse was first lit there in 1839. [3] The lighthouse was put up for sale in 2009 under the National Historic Lighthouse Preservation Act. [4]

5. Aurora borealis lights Northern Michigan skies following ...

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6. Northern lights likely to be visible in Northern Michigan for ...

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7. Grays Reef Light - Wikipedia

   en.wikipedia.org/wiki/Grays_Reef_Light

   The Grays Reef Light is a lighthouse located in northeastern Lake Michigan, 3.8 miles (6.1 km) west of Waugoshance Island in Bliss Township, Michigan. It was listed on the National Register of Historic Places in 2005.

8. Northern lights in Michigan: You may see them again tonight ...

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9. Manitou Passage Underwater Preserve - Wikipedia

   en.wikipedia.org/wiki/Manitou_Passage_Underwater...

   The Manitou Passage Underwater Preserve is a preservation area in the U.S. state of Michigan. Located in Lake Michigan, it completely surrounds North Manitou Island and South Manitou Island. It includes much of that portion of Lake Michigan that borders the federally protected Sleeping Bear Dunes National Lakeshore. [1]