Sunken Treasure

The Ship Behind the Name

Perry Correll

August 22, 2026

9 min

If you’ve wondered why a treasure hunting site is named after a word that doesn’t mean anything to most English speakers — you’re not wrong to wonder. Seeadler is German for “sea eagle,” and it’s also the name of one of the strangest, most genuinely remarkable ships to ever sail during wartime. As a military historian, I’ve read a lot of unlikely true stories. This one still gets me every time.

A cargo ship, twice stolen

The ship that became the Seeadler started life in 1888 as the Pass of Balmaha, an ordinary British steel-hulled cargo windjammer built in Scotland. In 1915, sailing under a neutral American flag with a cargo of cotton bound for Russia, she was stopped by a British warship, boarded, and ordered to fly the British flag instead — which immediately made her a legitimate wartime target. Days later, a German U-boat intercepted her. Rather than get caught with a British prize crew hidden in the hold, the ship’s captain handed the British sailors over to the Germans himself. The ship became German property on the spot — stolen, in effect, twice in one week, by two different navies, without a single shot fired.

By 1916, Germany had a real problem: their warships were bottled up in the North Sea, and any raider that broke out had nowhere to refuel. Someone had a strange, brilliant idea — a sailing ship doesn’t need coal. So the captured Pass of Balmaha was quietly refitted as the Seeadler: an auxiliary diesel engine hidden below deck, two 105mm guns concealed behind the forecastle, machine guns hidden in false compartments, and berths built to hold prisoners. Disguised as a harmless Norwegian timber carrier, she slipped straight through the British blockade — a British boarding party inspected her and let her go, fooled partly because the crew had been hand-picked for their ability to speak convincing Norwegian.

Fifteen ships, one death

What happened next is the part that still seems almost unbelievable. Over the next 225 days, the Seeadler captured or sank sixteen Allied merchant ships across the Atlantic and Pacific — and in that entire campaign, there was exactly one accidental death, on either side, total.

That wasn’t an accident of luck. It was policy. The Seeadler’s captain, Felix von Luckner, ran his raiding campaign closer to old-world piracy manners than modern naval warfare — board a ship, take the crew and any valuables, sink or burn the vessel, and treat the prisoners well enough that several of them later spoke almost fondly of their captor. He earned the nickname Der Seeteufel — “the Sea Devil” — and his crew were known as Die Piraten des Kaisers, “the Emperor’s Pirates.” British and American warships hunted him across two oceans for months and never once caught him in open water.

The most interesting man on either side of the war

Von Luckner’s own life before the war reads like it was invented for a novel, except it wasn’t. Born into German nobility, he ran away to sea at thirteen and spent years afterward doing everything except what was expected of him: selling newspapers for the Salvation Army in Australia, working as a lighthouse keeper, hunting kangaroos, training as a boxer, and — genuinely — joining a circus. He came back to Germany, joined the navy almost as an afterthought, and ended up commanding the last real fighting sailing ship in naval history.

After the war he became something rarer still: a German war hero who was also broadly respected by the people he’d fought against, admired for conducting an entire campaign against enemy shipping with almost no loss of life. Decades later, he was one of the few prominent Germans of his generation to publicly and repeatedly refuse to cooperate with the Nazi regime — reportedly warning Jewish acquaintances to flee and using his old international reputation to speak against Hitler when it was genuinely dangerous to do so.

How it actually ended

The Seeadler’s run ended almost anticlimactically. In August 1917, needing to scrape her hull clean, she anchored outside the reef at Mopelia — a tiny, remote atoll in French Polynesia, so small it couldn’t fit her inside its lagoon. A sudden wave — some accounts call it a tsunami, others a rogue swell — lifted the ship and drove her onto the coral reef, destroying her completely. Nobody died. Von Luckner and a handful of crew set out in an open boat to reach Fiji, eventually got captured, escaped a New Zealand POW camp by stealing the commandant’s own boat, and were recaptured again weeks later. The sailors left behind on Mopelia eventually seized a French schooner that had sailed in hoping to salvage the wreck, and made their own escape attempt — which also ended in capture, this time in Chile.

What’s actually still down there

Here’s the detail that got me, and the reason this ship’s name is on this website instead of just in a book on my shelf: real, physical pieces of the Seeadler are still sitting on the seafloor off Mopelia today, in water shallow enough to free-dive. People who’ve actually made the trip — and it is a genuine trip, since Mopelia has no airstrip, no hotel, and only a handful of permanent residents — have documented anchors, the ship’s windlass, her rudder, shell casings, piping, tanks, and a large two-cylinder engine, much of it in under 20 feet of water right off the reef pass.

There’s no dive shop. No mooring buoy. No charter boat that runs there on a schedule. Getting to the Seeadler means sailing there yourself, or finding someone who already is. That’s precisely what makes it different from almost every other wreck story on this site — it’s not a question of research or permits or the right season. It’s a question of somehow getting a boat to one of the most remote inhabited places on Earth.

I haven’t done it. I’d like to, someday, before I’m done with this hobby entirely. Not because there’s treasure down there in any conventional sense — by every account, the site’s been picked over by weather and the occasional visiting diver for over a century now. I want to go because it’s the actual ship, sitting where it actually sank, and because the story of how it got there is one of the best true stories I know.

That’s the name on the door. Now you know why.