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.

A higher resolution sidescan sonar image of the same vessel as seen in image expl4054.

Sidescan sonar image of sunken schooner found in the Hudson River.

Multi-beam sonar image of sunken schooner found in the Hudson River.

Sidescan sonar image of the MONITOR. Note that the illuminated area is the reflection and dark is the shadow with this display system.

Digital terrain model of the MONITOR with 1/4 meter resolution. This image was derived from high-resolution multi-beam bathymetry. This is illustrative of the limitations of high-resolution vessel-mounted multi-beam sounding systems. The deeper the water for a given beam width, the lower the resolution as the beams spread out geometrically from the surface.

Submarine S5 sidescan sonar image.

Submarine S5 sidescan sonar image. This was obtained by knowing the orientation of the submarine and maneuvering the sidescan such that its track ran parallel to the vessel. Note that the illuminated area is the reflection and dark is the shadow with this display system.

A multi-beam sounding record of a sunken barge.

Wreck of vessel discovered on Stratford Shoal SW of Bridgeport. Sidescan image.

Wreck of vessel discovered on Stratford Shoal SW of Bridgeport. String of lobster pots to right of sidescan track.

3-D multibeam imagery of eastern Stratford Shoal.

3-D multibeam imagery of north Stratford Shoal showing pockmarks similar to those found in Belfast Bay, Maine.

Photo mosaic of sunken vessel.

Derelict fish trap as imaged by very high resolution multi-beam sonar

High-resolution sidescan image of pile of tires dumped to produce a Delaware Bay fish haven.

Tug with current scour marks around wreck. Large sand waves evident as well. Multi-beam image.

Wreck of steamer VOLUND found in "The Race", southeast of Valiant Rock. The VOLUND sank in 1908. Sidescan image.