This is for my mother, who had to tolerate human bones and stone tools in her bathtub as I learned about the past as a teenage archeologist. And for making her cry as a middle-aged archeologist who dives in dangerous places because, as she points out, I’ll always be her little boy.

This is also for Ann, who keeps the home fires burning while juggling a career and an often missing-in-action archeologist.

And last, for Beau, my faithful feline companion during many an evening’s writing marathon. It’s not the same without him.

Ships and their crews have been sailing off into oblivion since the dawn of recorded history. Through the millennia, more than a million ships have sunk or gone missing, along with untold numbers of their crews. A million ships is an impressive statistic not believed by most landsmen. Yet, to call the seven seas a vast cemetery is an understatement.

During the ages, storms have wreaked havoc on entire fleets, some consisting of more than a thousand ships, that were torn apart and hurled to the bottom. The first tragedy may have taken place when one of our Cro-Magnon ancestors happily discovered he could float on water atop a log, at least until he fell off and drowned. From that time forward, huge ships, small boats and men have vanished in an unending surge beneath the waves into dark watery depths that have yet to resurrect their dead.

Except for divers holding their breath and diving in shallow water, shipwrecks seemed as impossible to reach and touch as a rock on the moon. Finally, less than two hundred years ago, divers in hard hats, breathing air pumped down from the surface, started working on the sea bottom and riverbeds. At long last, the sea begrudging began to give up her secrets.

Treasure and salvage came into their own. Salvage became a thriving enterprise, while treasure hunting was about as hit or miss as buying stocks in a bear market. Suddenly, shipwrecks in shallower waters became accessible. The boom was on, and shipwrecks were discovered and studied in a prodigious number of projects. Soon, modern technology enabled the salvage of wrecks thousands of feet deep beneath the sea’s surface.

The dead in the depths of the sea have no tombstones, no grave markers, nothing to identify their remains that quickly cease to exist. There is an eerie feeling about diving on a shipwreck. You can sense the presence of the crew that died with the ship. A wizened old diver once said that swimming through a shipwreck was like walking through a haunted house.

The last to come on the underwater scene were the marine archeologists. These are about as strange and diverse people as you could ever hope to meet. They seldom become wealthy, and their main claim to fame is in their reports on shipwreck explorations, surveys and artifact removal for conservation and study. Some publish books on their expeditions, some teach, while many work in the commercial end, surveying for government or private corporations that develop properties along waterfronts which might contain history. Not until an accredited archeologist declares the site free of historical artifacts can they begin construction.

Nautical archeologists fight like the furies to preserve a wreck and keep it out of the hands of salvers, treasure hunters and sport divers who are out to pillage shipwrecks of historic significance. Mostly they win, but often they lose the battle to protect a wreck from looters. Their biggest problem is money. Few state, local and federal government agencies have the funding to preserve shipwrecks, so the archeologists squeak by on shoestring budgets from one project to the next.

One who has made a difference is Jim Delgado, a man whose dedication and hard-earned efforts have made a contribution to the field of nautical archeology that cannot be equaled. Of all the archeologists I’ve known in my years of chasing after historical shipwrecks, he is one of the few who has his feet on the ground and knows more about lost ships than the Congressional Library and Lloyd’s of London wrapped up together. His exploits beneath the sea have become legendary.

I’m honored and privileged to call him a friend.

For the last thirteen years, I have shared my passion for the past with the public through books and newspaper articles, as a television “talking head” and host, and as a museum director. After I learned how to dive and embarked on a career with the U.S. National Park Service, I traveled the United States, and then the world, in search of shipwrecks. Not all of them were famous, but in the last few decades, the wrecks I’ve been privileged to see and explore have included some notable ones. But what really keeps me fired up with a passion for the past are the connections to everyday people like you and me. Often, it’s an unidentified wreck or the mute evidence of a life forever interrupted that moves me, and grounds the scientist in the firm reality of the human condition. Recently, I’ve enjoyed a new set of adventures “in search of famous shipwrecks,” thanks to John Davis, producer of the National Geographic International television series The Sea Hunters. Working with John, together with co-host and famous novelist, raconteur and shipwreck hunter Clive Cussler, master diver Mike Fletcher, his diving son Warren and a great crew behind the camera, is a wonderful experience. We’ve made dives on many of history’s legendary ships, from Titanic to lost warships and fabled fleets like the one Kublai Khan sent to conquer Japan in 1274. It’s great fun to work with Clive, whose passion is wrecks, particularly finding them when no one else can. With his blessing, we’ve joined the extended National Underwater and Marine Agency (NUMA) family that he founded, working in the field as more of his “sea hunters” scouting the world’s waters for shipwrecks.

In those seven seas, we’ve encountered history and the stories of the people who make history. Part of the record of humanity’s achievements, its triumphs and tragedies, rests out of sight on the seabed: the greatest museum of all lies at the bottom of the sea. My desire to see and touch the past and share it with others continues thanks to the friends and colleagues who have joined me on the ongoing quest. What I’ve learned along the way from these shipwrecks, both the unknown and the famous, is that they all have tales to tell. Sometimes their broken bones tell me who they are and how they died. Sometimes the story of their birth, their careers and the personalities who sailed in them also come to light, resurrected from the darkness of the deep or the back rooms of an archive. Nearly every time I dive, I am reminded of archeologist Howard Carter’s famous comment at the door to Tutankhamen’s tomb. No one had passed that threshold in thousands of years. Carter opened a small hole and held up a light as he peered into the darkness of millennia, now briefly illuminated again. “What do you see?” he was asked. “Wonderful things,” he answered.