The S.S. Suddhadib Mystery Sunk by a Bomb That Never Exploded
Updated: 2 days ago
Samaesan Bay in the Gulf of Thailand is home to one of the most celebrated and intriguing shipwrecks in Southeast Asia: the S.S. Suddhadib (widely known to the scuba community as the "Hardeep" wreck). Resting on her starboard side at a maximum depth of 26 metres, she is a magnet for wreck divers, history buffs, and marine life alike.
But beneath her coral-encrusted steel lies a fascinating historical paradox: the Suddhadib was sunk by a bomb that technically never exploded.
At Dream Team Divers, we love diving into the history of our sites as much as we love exploring them underwater. Let’s unravel the wartime mystery of the S.S. Suddhadib, from its royal beginnings to the low-altitude skip-bombing run that sealed its fate.
1. A Royal Beginning: The Pride of the Siam Steamship Co.
Long before she was a wartime wreck, this 68.11-metre steamship was a symbol of national pride. Built in 1918 in Hong Kong by the prestigious Hong Kong & Whampoa Dock Company, she was constructed for the Bangkok-based Siam Steamship Company (part of the Danish-owned East Asiatic Company).
She was named Suddhadib after the most beautiful daughter of King Rama V, Princess Suddhadib. When the ship arrived in Bangkok in 1919, Princess Suddhadib herself attended the blessing ceremony and was presented with a silver model of the vessel. For over two decades, the passenger-cargo ship carried travelers and freight across Southeast Asia.
However, as World War II engulfed the region, her peaceful service came to an end. In 1940, she was appropriated by the Thai government and re-registered under the government-owned Thai Navigation Company. Her mission shifted from civilian commerce to transporting critical cargo and fuel to support the war effort.
2. June 1, 1945: The "Sitting Duck" at Koh Chuang
By late May 1945, the S.S. Suddhadib had returned from Singapore laden with a large shipment of fuel drums destined partly for the Thai Fuel Company (predecessor of PTT) and partly for the occupying Japanese military forces. Due to Allied naval mines blocking the mouth of the Chao Phraya River, the ship could not enter Bangkok and was forced to anchor at the Sattahip naval base.
After surviving an unsuccessful medium-altitude Allied bombing raid on Sattahip on May 30, the Royal Thai Navy commander, Admiral Kanok, ordered the Suddhadib and other vessels to disperse to nearby islands to avoid being grouped together in another raid. The Suddhadib was moved to the relative shelter of Koh Chuang in Samaesan Bay.
She had no defensive cannons. Anchored near the island, she was a literal "sitting duck."
3. The 15-Hour Bumpy Ride from India
At 5:41 AM on June 1, 1945, the first of 23 B-24 Liberator bombers rolled down the runway at the RAF airfield in Digri, India (near Calcutta). Representing RAF Squadrons 99 and 159, the crew members—a mix of British, Canadian, and Australian airmen—faced a grueling, turbulent 6-hour flight through monsoon weather at 10,000 feet.
Their primary target was the submarine depot ship HTMS Angthong anchored in Sattahip. When the bombers arrived around noon, the weather cleared, offering excellent light and visibility. While high-altitude bombers targeted and successfully hit the Angthong, the rest of the squadron turned their attention to secondary targets in the bay: the HTMS Tachin and the S.S. Suddhadib.
4. Low-Level Skip-Bombing: Sunk by Kinetic Force
To ensure direct hits on the ships, the Allied pilots employed a thrilling and highly dangerous tactic: skip-bombing.
Flying at an extremely low altitude of under 150 feet (50 metres), the bombers dropped their 1,000-pound M-59 bombs, intending for them to skip across the water's surface like flat stones, slam into the side of the ship, sink, and detonate from underneath. The run was so low that crew members later reported some bombs actually skipped entirely over the Suddhadib!
Wing Commander Lucien Ercolani, piloting the B-24 bomber marked "T", made the decisive low-level run on the Suddhadib. He released a 1,000lb bomb directly toward the forward cargo hold.
Because the drop altitude was so low (under 150 feet), the propeller-driven tail-fuse of the M-59 bomb never had enough air travel distance to spin and arm itself.
The bomb did not explode.
Instead, the sheer kinetic force of the unexploded 1,000-pound steel missile punched cleanly through the Suddhadib's hull. This impact triggered a massive, secondary fuel explosion as the shipment of fuel drums on board ignited. The mushroom cloud of smoke and fire rose into the sky as the bomb exited the ship and sank to the seabed.
With her forward cargo hold engulfed in flames, the Suddhadib began to tilt forward and to her starboard side. At 12:55 PM, just 19 minutes after the attack began, she slipped beneath the waves.
Remarkably, all 15 crew members had already abandoned ship and swam safely to the nearby shores of Koh Chuang. There were zero casualties.
5. Diving the S.S. Suddhadib Today
Today, the "Hardeep" is widely regarded as one of Thailand’s premier wreck dives, and diving her with Dream Team Divers is like stepping back into a WWII living museum. Here is what you can expect on this legendary dive:
· The Structure: The wreck lies on its starboard side at a maximum depth of 26 metres. While the engine room contains three massive boilers and scattered coal, you will notice a large, clean rectangular hole cut into the port side (the "top" of the wreck). This is not bomb damage! Post-war local salvagers cut this hole to crane out the ship's 3-cylinder steam engine.
· The "Hardeep Cathedral": Sunlight streams through the open cargo holds, creating a beautiful "cathedral" effect that is a favorite for underwater photographers. The holds are wide, well-ventilated, and provide a fantastic opportunity for safe penetration diving.
· The Lethal Relics: True to history, two unexploded 1,000-pound M-59 bombs still rest on the sandy seabed nearby, approximately 100 to 150 metres from the wreck at a depth of 27 to 33 metres. One bomb lies exactly in alignment with the bomber's flight path, a silent testament to the raid that took place over 80 years ago.
· The Marine Life: Over the decades, the Suddhadib has been completely reclaimed by nature. Divers can spot a resident sea turtle, giant groupers, schools of jacks, stingrays, starry pufferfish nesting above the boilers, and vibrant nudibranchs clinging to the coral-encrusted hull.
A Note on Conservation
Unfortunately, the wreck and surrounding reefs have suffered damage in recent years from illegal dynamite fishing. At Dream Team Divers, we advocate for the absolute protection and preservation of this historic dive site. We train our divers to practice impeccable buoyancy and respect the wreck so that future generations can experience this incredible piece of maritime archaeology.
Book Your Wreck Adventure with Dream Team Divers!
Are you ready to explore the S.S. Suddhadib and witness WWII history resting under the sea? Whether you are a recreational diver looking to experience the stunning "Cathedral" or an advanced diver wanting to practice penetration and deep wreck navigation, our experienced guides at Dream Team Divers are ready to take you there.
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