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Underwater images - SARI_DUW_150515-125

Underwater images - SARI_DUW_150515-125

The boat mooring in Salt River canyon is in about 20 feet of water, and perfect for a safety stop or longer decompression. Here, the colors are much more vibrant and abundant barrel sponges and sealife makes ti... More

Underwater images - SARI_DUW_150515-174
Underwater images - SARI_DUW_150515-107

Underwater images - SARI_DUW_150515-107

The precise origin of Salt River canyon is unknown although it is thought to be an ancient river course. For more information, see: http://www.aoml.noaa.gov/general/lib/CREWS/Cleo/St.%20Croix/salt_river170.pdf

Underwater images - SARI_DUW_150515-102

Underwater images - SARI_DUW_150515-102

Deep brown tube sponges are colorful when lit with an underwater strobe. Without lights, at greater depths, everything appears drab and colorless.

Underwater images - SARI_DUW_150515-143

Underwater images - SARI_DUW_150515-143

If a diver is familiar with other Caribbean dives, he or she will be surprised by the wonderfully strange Salt River canyon formations - unique in all the world - which is why it's often among the top dive site... More

Underwater images - SARI_DUW_150515-112

Underwater images - SARI_DUW_150515-112

The canyon environments are easily accessed from shore by boat. Several local operators run daily dive trips to Salt River.

Underwater images - SARI_DUW_150515-162

Underwater images - SARI_DUW_150515-162

Soft and Hard corals and schools of fish in about 130fsw.

Underwater images - SARI_DUW_150515-156

Underwater images - SARI_DUW_150515-156

White Spotted Filefish can darken and lighten almost instantaneously!

Underwater images - SARI_DUW_150515-111

Underwater images - SARI_DUW_150515-111

The canyon walls are a dense and diverse environment - it is no wonder to dive the St. Croix wall is on many divers "bucket list."

Underwater images - SARI_DUW_150515-121

Underwater images - SARI_DUW_150515-121

Net accretion on the reef has been very slow. With a mere 20 minutes of bottom times at depths of 130ft, there is not a lot of time to ponder 10,000 years of development! Scientists have taken core samples and... More

Underwater images - SARI_DUW_150515-108

Underwater images - SARI_DUW_150515-108

A diver must monitor their depth gauge carefully, particularly in clear conditions. All recreational divers should stay within the 130fsw limit - there is much to see above these depths and nothing below to ris... More

Underwater images - SARI_DUW_150515-100

Underwater images - SARI_DUW_150515-100

Overlapping colonies of thin sheet coral populate the sheer canyon walls for hundreds of feet.

Underwater images - SARI_DUW_150515-131

Underwater images - SARI_DUW_150515-131

Diver and Purple tube sponge

SARI_DUW_150515-124

SARI_DUW_150515-124

NOAA Underwater Laboratory System (NULS-1) a.k.a. Hydrolab - Constructed in 1966, the Hydrolab was used as a research lab beginning in 1970. The Hydrolab, which was stationed 50-feet underwater in the Salt Rive... More

Space Radar Image of Raco, Michigan, Ecological Test Site

Space Radar Image of Raco, Michigan, Ecological Test Site

This is an X-band image of seasonal changes at the ecological test site of Raco, Michigan, located south of Whitefish Bay on Lake Superior. The image is centered at about 46 degrees north latitude and 85 degree... More

Upper Newport Bay Nature Preserve and Ecological Reserve, approximately 1,000 acres of open space in California

Upper Newport Bay Nature Preserve and Ecological Reserve, approximatel...

Title, date, and keywords provided by the photographer. Credit line: The Jon B. Lovelace Collection of California Photographs in Carol M. Highsmith's America Project, Library of Congress, Prints and Photographs... More

A supraglacial stream carves the surface of Exit Glacier, Kenai Fjords National Park, 2015.
U.S. Army Sgt. Jacob Meinders (left), assigned to the

U.S. Army Sgt. Jacob Meinders (left), assigned to the

U.S. Army Sgt. Jacob Meinders (left), assigned to the 703rd Ordinance Company, 184th Ordinance Battalion, 52nd Ordinance Group, 20th Chemical, Biological, Radiological, Nuclear and Explosives (CBRNE) Command, a... More

Master Sgt. Joe Sommers, from the 111th Logistics Readiness

Master Sgt. Joe Sommers, from the 111th Logistics Readiness

Master Sgt. Joe Sommers, from the 111th Logistics Readiness Squadron with a primary duty of manning the Hazardous Material (HazMat) Pharmacy opens a cabinet in the HazMat Pharmacy at Horsham Air Guard Station, ... More

U.S. Army Sgt. Anthony Bowlds (left), assigned to the

U.S. Army Sgt. Anthony Bowlds (left), assigned to the

U.S. Army Sgt. Anthony Bowlds (left), assigned to the 759th Ordinance Company, 3rd Ordinance Battalion, 71st Ordinance Group, 20th Chemical, Biological, Radiological, Nuclear and Explosives (CBRNE) Command, dem... More

Senior Airman Igor Karlov, Master Sgt. Joe Sommers

Senior Airman Igor Karlov, Master Sgt. Joe Sommers

Senior Airman Igor Karlov, Master Sgt. Joe Sommers and Tech. Sgt. Robert Custer III, all from the 111th Logistics Readiness Squadron, stand in the totally empty Hazardous Material Pharmacy here at Horsham Air G... More

U.S. Army Sgt. Anthony Bowlds (left), assigned to the

U.S. Army Sgt. Anthony Bowlds (left), assigned to the

U.S. Army Sgt. Anthony Bowlds (left), assigned to the 759th Ordinance Company, 3rd Ordinance Battalion, 71st Ordinance Group, 20th Chemical, Biological, Radiological, Nuclear and Explosives (CBRNE) Command, dem... More

U.S. Army Pfc. William Helms (right), assigned to the

U.S. Army Pfc. William Helms (right), assigned to the

U.S. Army Pfc. William Helms (right), assigned to the 21st Ordinance Company, 71st Ordinance Group, 20th Chemical, Biological, Radiological, Nuclear and Explosives (CBRNE) Command, demonstrates his knowledge of... More

U.S. Army Sgt. Joshua Laplant (bottom), assigned to

U.S. Army Sgt. Joshua Laplant (bottom), assigned to

U.S. Army Sgt. Joshua Laplant (bottom), assigned to Headquarters and Headquarters Company, 48th Chemical Brigade, 20th Chemical, Biological, Radiological, Nuclear and Explosives (CBRNE) Command, demonstrates hi... More

U.S. army Spc Kyle O'Day (top), assigned to the 760th

U.S. army Spc Kyle O'Day (top), assigned to the 760th

U.S. army Spc Kyle O'Day (top), assigned to the 760th Ordinance Company, 63rd Ordinance Battalion, 52nd Ordinance Group, 20th Chemical, Biological, Radiological, Nuclear and Explosives (CBRNE) Command, demonstr... More

U.S. Army Jacob Meinders (top), assigned to the 703rd

U.S. Army Jacob Meinders (top), assigned to the 703rd

U.S. Army Jacob Meinders (top), assigned to the 703rd Ordinance Company, 184th Ordinance Battalion, 52nd Ordinance Group, 20th Chemical, Biological, Radiological, Nuclear and Explosives (CBRNE) Command, demonst... More

U.S. Sgt. Anthony Bowlds, assigned to the 759th Ordinance

U.S. Sgt. Anthony Bowlds, assigned to the 759th Ordinance

U.S. Sgt. Anthony Bowlds, assigned to the 759th Ordinance Company, 3rd Ordinance Battalion, 71st Ordinance Group, 20th Chemical, Biological, Radiological, Nuclear and Explosives (CBRNE) Command, conducts a deta... More

U.S. Army Jacob Meinders, assigned to the 703rd Ordinance

U.S. Army Jacob Meinders, assigned to the 703rd Ordinance

U.S. Army Jacob Meinders, assigned to the 703rd Ordinance Company, 184th Ordinance Battalion, 52nd Ordinance Group, 20th Chemical, Biological, Radiological, Nuclear and Explosives (CBRNE) Command, conducts a de... More

U.S. Army Jacob Meinders, assigned to the 703rd Ordinance

U.S. Army Jacob Meinders, assigned to the 703rd Ordinance

U.S. Army Jacob Meinders, assigned to the 703rd Ordinance Company, 184th Ordinance Battalion, 52nd Ordinance Group, 20th Chemical, Biological, Radiological, Nuclear and Explosives (CBRNE) Command, conducts a de... More

U.S. Army Sgt. Jacob Meinders, assigned to the 20th

U.S. Army Sgt. Jacob Meinders, assigned to the 20th

U.S. Army Sgt. Jacob Meinders, assigned to the 20th Chemical, Biological, Radiological, Nuclear and Explosives (CBRNE) Command, disassembles an M240B machine gun while participating in the 2016 20th CBRNE Comma... More