A model of the Fifth Rate British Warship, HMS Endymion in the Science Museum, London. Image Courtesy of Dr. Donald Keith.

A sketch of HMS Endymion'€™s last moments, going down by the head. Various notes and headings indicate exactly where the ship sank. Image Courtesy of Dr. Donald Keith.

Lance Milbrand shoots one of Endymion's four anchors. The curving piece beneath the anchor is part of Endymion'€™s stempost assembly. Photo Credit: Mike Cameron

Jeff Morris photographs one of the Companion Wreck's four anchors. The chain from this anchor lies across the top of the Endymion and leads back to the Companion Wreck'€™s chain locker. Photo Credit: Mike Cameron

Jeff Morris with one of the Companion Wreck'€™s four anchors. The chain from this anchor lies across the top of the Endymion and leads back to the Companion Wreck's chain locker. Photo Credit: Mike Cameron

One of the Companion Wreck'€™s four stockless anchors, this one still in its hawse pipe (the tube into which the shank of the anchor is drawn to hold it fast after weighing. Photo Credit: Mike Cameron

Jeff Morris leaves the main reef for the surrounding sand bars in search of artifacts that have been detected through the use of towed magnetometer. Photo Credit: Mike Cameron

Jeff Morris uses a Waitt Institute DPV to transit to the Companion wreck tanks which lay on a sand bar some 500 meters from the main body of the wreck. Photo Credit: Mike Cameron

Members of the Ops team and ship's Chief Engineer supervise the streaming and reloading of the ship'€™s sonar cable onto the winch. Photo Credit: Lance Milbrand

Mike Cameraon prepares the fiber optic tow cable and the side scan sonar tow-fish for a dive. Photo Credit: Lance Milbrand

Jeff Morris and Mike check and double check each connection on the Side Scan Sonar Towfish before it is deployed into the water. Photo Credit: Lance Milbrand

Mike Cameraon and Jeff Morris prepare the towfish and sonar for a dive. Photo Credit: Lance Milbrand

At the end of each day the Waitt expedition team gathers in the Operations area to analyze Side Scan Sonar data. Photo Credit: Lance Milbrand

Jeff Morris uses the Waitt ROV's video system to guide his control of the manipulator arms. Photo Credit: Lance Milbrand

The Waitt ROV makes a night dive. Photo Credit: Lance Milbrand

The Waitt Institute's Seaeye Falcon ROV waiting for a night dive. Photo Credit: Lance Milbrand

Jeff Morris fine tunes the Side Scan Sonar while Chief Engineer Peter Dorrington looks on. Photo Credit: Lance Milbrand

Jeff Morris explains the fiber optic system of the upgraded Side Scan Sonar utilized during the expedition. Photo Credit: Lance Milbrand

Chart showing Salt Cay, Great Sand Cay, and the southernmost part of the Turks Islands Bank. Photo Credit: Lance Milbrand

Dessner and Don engage in one of the many interesting debates spurred by Dr. Keith’s ever questioning nature. Photo Credit: Lance Milbrand

Side-scan sonar image on monitor showing potential target in upper right panel. Photo Credit: Lance Milbrand

Joe Lepore and Steve Bilicki stand a Side Scan Sonar watch while the ship tows in deeper water. Photo Credit: Lance Milbrand

Dessner and Keith share expedition stories in between sensor tows. Photo Credit: Lance Milbrand

The hardest working man in underwater cinematography, Lance Milbrand, doing his thing. Photo Credit: Jeff Morris

The Seaeye Falcon ROV in action. Photo Credit: Jeff Morris

The Seaeye Falcon ROV explores the bottom. Photo Credit: Jeff Morris

Lance Milbrand, grateful for the beautiful visibility at the Endymion site. Photo Credit: Jeff Morris

Nautica, the ship's designated dive RHIB (Rigid Hulled Inflatable Boat) prepares to load up for a long day diving on the two shipwrecks at Endymion Rock. Photo Credit: Michael Dessner

The side-scanning sonar fish mounted beneath the depressor wing that allows the fish to be towed in very deep water. Photo Credit: Michael Dessner

Exploring the Endymion site. Photo Credit: Dr. Donald Keith

Waitt Institute divers fly over the Endymion site. Photo Credit: Dr. Donald Keith

Nautica departs the ship for a day of diving on the two shipwrecks at Endymion Rock. Photo Credit: Lance Milbrand

Endymion reef lies just below the surface, an invisible ship trap. Photo Credit: Lance Milbrand

Jeff Morris returns to the surface after a dive on the Companion Wreck. Photo Credit: Lance Milbrand

Preparing to launch the DPV'€™s over the Endymion Rock site. Photo Credit: Lance Milbrand

Joe Lepore delivers a pre-dive briefing to ship's Captain and a crew member. Photo Credit: Lance Milbrand

Endymion'€™s cannons lie in a ragged line at the foot of one of the coral pinnacles on which she wrecked. Photo Credit: Dr. Donald Keith

The cascabel. H.M.S. Endymion. Photo Credit: Dr. Donald Keith

Michael Dessner measures one of Endymion’s cannon. Photo Credit: Dr. Donald Keith

Dr. Donakd Keith records cannon data on the Endymion site. Photo Credit: Lance Milbrand

Mike Cameron preparing for a dive aboard the main ship. Photo Credit: Lance Milbrand

Director of Operations, Michael Dessner, and Executive Director, Dr. Dominique Rissolo. Photo Credit: Lance Milbrand

Jeff Morris and Joe Lepore prepare the ROV for a test dive off Grand Turk. Photo Credit: Dominique Rissolo

Preparing to launch the Waitt ROV from the ship’s telescoping davit. Photo Credit: Lance Milbrand

The Waitt Institute's ROV goes in for a test dive. Photo Credit: Lance Milbrand

Ferrying equipment back to the Turks and Caicos National Museum. Photo Credit: Dominique Rissolo

Turks and Caicos National Museum. Photo Credit: Lance Milbrand

Returning to the ship from the Turks & Caicos National Museum. Photo Credit: Lance Milbrand

Returning to the ship from the Turks & Caicos National Museum. Photo Credit: Lance Milbrand

Front Street, Grand Turk as seen from the lagoon just off Front Street. Photo Credit: Lance Milbrand

Mike Cameron and Peter Dorrington analyze the Companion Wreck'€™s engine (on monitor). Photo Credit: Lance Milbrand

Mike Cameron and Peter Dorrington analyze the Companion Wreck'€™s engine (on monitor). Photo Credit: Lance Milbrand

Dr. Dominique Rissolo, Executive Director of the Waitt Institute, examines photos of the Companion Wreck. Photo Credit: Lance Milbrand

Casual outdoor dining during a rainstorm on Grand Turk. Photo Credit: Lance Milbrand

A photo mosaic of the entire H.M.S. Endymion site. Image Courtesy of Dr. Donald Keith.

An underwater sketch of the bronze double-horseshoe clamp that once held Endymion'€™s gripe to her stempost. Image Courtesy of Dr. Donald Keith.

An underwater sketch of the Companion Wreck's boiler. Image Courtesy of Dr. Donald Keith.

An underwater sketch of the Companion Wreck's Propeller shaft. Image Courtesy of Dr. Donald Keith.

Mike Cameron following the Companion Wreck's debris trail using a Diver Propulsion Vehicle (DPV). Photo Credit: Donald Keith

Joe Lepore uses a DPV to scout the perimeter of Endymion Rock. Photo Credit: Donald Keith

Detail of one of the two four-cylinder diesel engine blocks of the Companion Wreck. They were originally coupled together to make an eight-cylinder engine. Measuring stick is 1 m. Photo Credit: Donald Keith

One of the Companion Wreck's four-cylinder engine banks seen end-on. Photo Credit: Donald Keith

One of the four anchors on the Companion Wreck. Measuring stick is 1 meter. Photo Credit: Jeff Morris

The bronze double-horseshoe clamp that once held Endymion'€™s gripe to her stempost. Photo Credit: Donald Keith

The bronze double-horseshoe clamp that once held Endymion'€™s gripe to her stempost. Photo Credit: Donald Keith

One of the Companion Wreck's four stockless anchors. Its chain runs across the top of HMS Endymion back to the Companion Wreck'€™s chain locker. Photo Credit: Jeff Morris

The Companion Wreck'€™s eight-cylinder diesel engine (lower left) lies in a gulley between two arms of the reef. Photo Credit: Jeff Morris

One of six large riveted iron compartments probably used for fuel and water storage on the Companion Wreck. Photo Credit: Jeff Morris

Divers take critical measurements of the Companion Wreck’s eight-cylinder diesel engine that will enable them to estimate when the engine was manufactured. Photo Credit: Jeff Morris