An iron plate from the HASSLER's bow embedded in the rock pinnacle that sank the ship in 1898.

Remains of forward deck plates of the HASSLER.

Dr. John Jensen of the Sea Education Association of Woods Hole, Massachusetts, and Dave McMahan, Alaska State Archaeologist, preparing to dive on the remains of the HASSLER.

Details of the double hull of the HASSLER.

Baseline measurement over the engine area of the HASSLER.

Baseline measurement over the engine area of the HASSLER.

Plan view of the engine area of the HASSLER.

Baseline measurement over the engine area of the HASSLER.

An iron plate from the HASSLER's bow embedded in the rock pinnacle that sank the ship in 1898.

Tapering of hull space between double bottoms is evident at ship extremities.

Dr. John Jensen launching the Seabotix tethered robotic vehicle used on this mission to study the HASSLER.

Boiler stays of the HASSLER.

An iron plate from the HASSLER's bow embedded in the rock pinnacle mission to study the HASSLER.

Rudder of the HASSLER.

The shaft of the HASSLER.

The shaft of the HASSLER.

A marine archeologist measuring the baseline along the propeller shaft of the . HASSLER.

Looking forward from the starboard quarter of the HASSLER.

Dr. Hans Van Tilburg tending divers working on the HASSLER. Eldred Rock Lighthouse is in the background.

Bitts on the HASSLER.

Boiler face of the HASSLER.

A marine archaeologist taking measurements of the boiler face of the HASSLER.

A marine archaeologist taking measurements of the boiler face of the HASSLER.

A marine archaeologist taking measurements of the boiler face of the HASSLER.

A marine archaeologists sketch of the debris field of the HASSLER.

A view of the Seabotix ROV operating underwater studying the debris field of the HASSLER.

Dr. Hans Van Tilburg documenting the dimensions and orientation of the rudder of the HASSLER.

Dr. Hans Van Tilburg documenting the dimensions and orientation of the rudder of the HASSLER.

Dr. Hans Van Tilburg documenting the dimensions and orientation of the rudder of the HASSLER.

An unidentified artifact in the debris field of the HASSLER.

Archaeological crew on Eldred Rock with the lighthouse in the background. L. to R. - Hans Van Tilburg, Dave McMahan, Tane Casserley, and John Jensen.

The survey vessel LEGEND used to explore the remains of the S.S. CLARA NEVADA, formerly the United States Coast and Geodetic Survey Steamer HASSLER, which struck near this rock and sank on February 5, 1898.

Exploring a derelict wrecked on the reef

All that remains above water of an unnamed vessel wrecked on the reef long ago.

Remains of a once noble vessel that has been battered by waves and storm for decades

The wreck of the schooner E. B. ALLEN. Bow.

The wreck of the schooner E. B. ALLEN. Bow.

The wreck of the schooner E. B. ALLEN. Windlass.

The wreck of the steamer GRECIAN.

The wreck of the steamer MONTANA.

The wreck of an unidentified vessel. Bow and windlass.

Screen capture of bridge of submarine U166

Screen capture of deck gun of submarine U166

Fathometer record of a wreck showing 10 meters of relief and scour holes around wreck. It is rare that such a record is obtained. It is probable that this wreck was located by sidescan sonar and then passed over with the survey vessel operating its single-beam sounding instrument. Cove Point wreck.

Sidescan sonar record of ship on seafloor. The black is the reflection and the white area is shadow. The yellow line indicates where the least depth will probably be found on this wreck. Cove Point wreck.

3-D rendition of a sunken vessel obtained from processed multi-beam sounding information. This was the wreck of the ship BOW MARINER.

3-D rendition of a sunken vessel obtained from processed multi-beam sounding information. This was the wreck of the ship BOW MARINER.

Plan view of a sunken vessel obtained from processed multi-beam sounding information. This was the wreck of the ship BOW MARINER.

Port side view of sunken ship BOW MARINER obtained by NOAA Ship RUDE using 100-meter sidescan sonar range.

Sidescan sonar image of sunken vessel. Cargo hatches are apparent and possibly bowsprit. Large arcuate pattern would require divers inspection to determine cause.