Mason Blake
Iron Bottom Sound, located in the Solomon Islands, is a body of water that was the site of five major naval battles between August and December 1942, resulting in the loss of thousands of lives, naval vessels, and planes. The underwater cultural heritage sites from these battles rest on the seafloor at depths of up to 1,400 meters. The area has gained its nickname from the numerous ships that sank in its waters, with their wrecks now attracting divers and explorers seeking to uncover the maritime history of Guadalcanal.
| Characteristics | Values |
|---|---|
| Location | Solomon Islands, between Guadalcanal, Savo, and Nggela islands |
| Area | 25 nautical miles wide, 40 nautical miles long |
| Depth | 1,400 meters |
| Battles | Five major naval battles between August and December 1942 |
| Losses | Over 20,000 lives, 111 naval vessels, and 1,450 planes |
| Exploration | Led by Dr. Robert Ballard using advanced deep sea technology |
| Notable Wrecks | USS New Orleans, HMAS Canberra, USS Laffey |
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What You'll Learn
- The Solomon Islands' Iron Bottom Sound is 1,400 metres deep
- Five major naval battles were fought here between August and December 1942
- Over 20,000 lives, 111 naval vessels, and 1,450 planes were lost
- The wrecks of US, Japanese, Australian, and New Zealand military ships and planes remain
- The area is being explored by Dr Robert Ballard and his team
The Solomon Islands' Iron Bottom Sound is 1,400 metres deep
Diving the deeper wrecks in Iron Bottom Sound has been a sought-after experience for divers, but the resources for conducting deep technical dives in that area are limited. The area is known for its deep wrecks, which have been discovered and documented by explorers like Paul Allen and Robert Ballard using expensive and advanced deep-sea technology.
In July 2025, a team of scientists and explorers aboard the Exploration Vessel Nautilus located and imaged the bow of the World War II heavy cruiser USS New Orleans for the first time. The bow was found resting at a depth of about 675 meters in the Solomon Islands' Iron Bottom Sound. The USS New Orleans was hit by a Japanese 'Long Lance' torpedo during the November 1942 Battle of Tassafaronga, resulting in a catastrophic detonation that killed over 180 crew members.
The Nautilus Live Ocean Exploration Trust blog writes about the wrecks that lie between Savo Island and Guadalcanal, silent witnesses to a fight that marked a turning point in the war that continues to impact the modern Pacific. Audiences can join real-time explorations of the waters surrounding Guadalcanal and learn about the naval battles that changed history.
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Five major naval battles were fought here between August and December 1942
Iron Bottom Sound, located in the Solomon Islands between Guadalcanal, Savo, and Nggela Islands, was the site of five major naval battles fought between August and December 1942. The waters around Guadalcanal became the stage for intense naval engagements that marked a pivotal shift in the Pacific Theatre of World War II. The first major naval confrontation occurred near Savo Island on 9 August 1942, where the Allied and Japanese fleets clashed under the cover of night. The USS Astoria was lost in the Battle of Savo Island, and the HMAS Canberra, a 187-meter-long County-class heavy cruiser, was one of four Allied heavy cruisers sunk during the battle. The Japanese lost multiple destroyers and the battleship Kirishima, and their troop transport and equipment convoy was devastated by US aircraft the following day.
The USS Laffey, a Benson-class destroyer, sank on 12 November 1942 after sustaining a torpedo strike during the First Naval Battle of Guadalcanal. The US Navy and Marines lost over 400 aircraft in the campaign, and the Japanese lost somewhat more. The battles in between were all narrow wins or losses for either side, all with substantial casualties. The battles around Guadalcanal were bookended by two of the worst defeats in US naval history (Savo Island and Tassafaronga), surpassed only by Pearl Harbor.
The US and Japanese battleships clashed at close range, marking a rare surface gunfight between battleships in the modern era. Radar-directed firepower altered the course of the battle, proving that radar-equipped ships had a massive advantage in night combat, which helped the US level the playing field against the Japanese. After this battle, Japan ceased its major efforts to reinforce Guadalcanal with additional personnel, effectively conceding the fight for the island and airfield. The five battles in Iron Bottom Sound resulted in the loss of over 20,000 lives, 111 naval vessels, and 1,450 planes. Many wrecks from the battles remain undiscovered on the seafloor, which is over 1,400 meters deep.
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Over 20,000 lives, 111 naval vessels, and 1,450 planes were lost
Iron Bottom Sound, located in the Solomon Islands between Guadalcanal, Savo, and Nggela Islands, was the site of five major naval battles fought between August and December 1942. The campaign claimed more than 111 ships and 1,450 aircraft, with over 20,000 lives lost.
The first major naval confrontation occurred near Savo Island, where Allied and Japanese fleets clashed under the cover of night. The battles were fought between the United States, Japan, Australia, and New Zealand. Many wrecks from the battles remain undiscovered, resting on the seafloor in a confined area less than 25 nautical miles wide, 40 nautical miles long, and 1,400 meters deep.
The losses highlight the deadly intensity of close-range warfare and the evolving naval warfare technologies of the time. The large number of vessels lost in shallow water can be attributed to the success of air coverage from Henderson Field. Starvation and disease also contributed to the high number of lives lost during the Guadalcanal campaign, with nearly 35,000 lives lost on the islands.
The exploration of these underwater cultural heritage sites provides insights into the Maritime History of Guadalcanal and honours the stories of service and sacrifice made by WWII service members. The discoveries of these sites help close the gap for families who lost loved ones and provide a reminder of the valor and sacrifices of sailors who fought with tenacity and skill.
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The wrecks of US, Japanese, Australian, and New Zealand military ships and planes remain
Iron Bottom Sound, located in the Solomon Islands between Guadalcanal, Savo, and Nggela Islands, was the site of five major naval battles between August and December 1942. These battles resulted in significant losses for both the Allied and Japanese forces, with over 20,000 lives lost, along with 111 naval vessels and 1,450 planes. The wrecks of these battles, including US, Japanese, Australian, and New Zealand military ships and planes, remain on the seafloor as a reminder of the intense conflicts that took place.
The Battle of Guadalcanal and the broader Solomon Islands Campaign marked a turning point in World War II, as the Allies sought to halt Imperial Japanese expansion in the Pacific. The stretch of water where these battles occurred was originally known as Savo Sound, but as more and more ships met their end on the seafloor, it earned the nickname "Iron Bottom Bay" or "Ironbottomed Sound" among Allied sailors, which eventually evolved into the name Iron Bottom Sound.
Among the wrecks that rest in Iron Bottom Sound are the USS Laffey, a Benson-class destroyer that sank after a torpedo strike during the First Naval Battle of Guadalcanal; the USS Hornet (CV-8), an aircraft carrier lost during the Battle of the Eastern Solomon Islands; and the USS Wasp (CV-7), another aircraft carrier lost during a resupply operation. The HMAS Canberra, a County-class heavy cruiser of the Royal Australian Navy, was also lost during the Battle of Savo Island, making it the largest ship of its kind ever lost by the RAN in combat.
The depths of the wrecks vary, with some accessible to scuba divers, while others require specialized training and equipment to reach. The USS Seminole (AT-65), for instance, lies at a depth of 33.5 meters and is only accessible during the dry season. The USS Atalanta (CL-51) and USS Aaron Ward (DD-483) are located at depths of 131 meters and 70 meters, respectively, and can only be explored by specially trained and equipped divers. The average depth of Iron Bottom Sound is reported to be around 600 meters, with the entire area spanning a confined region of less than 25 nautical miles wide and 40 nautical miles long.
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The area is being explored by Dr Robert Ballard and his team
Iron Bottom Sound, located in the Solomon Islands, was the site of five major naval battles between August and December 1942. Over 20,000 lives were lost, along with 111 naval vessels and 1,450 planes. The area gained the infamous nickname "Iron Bottom Sound" due to the staggering loss, with ships left to rust on the seafloor forever.
Dr Ballard's team is also utilising the remotely operated vehicles E/V Nautilus, Hercules, and Atalanta to conduct non-invasive archaeological surveys of the identified sites. These vehicles provide live video footage of the shipwrecks, allowing audiences to join the exploration in real-time. The team has made new discoveries of ships' resting places and created the highest-quality maps of the area to date.
One notable discovery was the HMAS Canberra, a 187-metre-long County-class heavy cruiser lost during the Battle of Savo Island on 9 August 1942. The team was able to locate the original plaque placed on the wreck by Dr Ballard and his team during their 1992 expedition. Another explored site was the 106-metre-long Benson-class destroyer USS Laffey, which sank on 12 November 1942, after a torpedo strike during the First Naval Battle of Guadalcanal.
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Frequently asked questions
Iron Bottom Sound is around 1,400 meters deep.
Iron Bottom Sound is located in the Solomon Islands, between the islands of Guadalcanal, Savo, and Nggela.
Iron Bottom Sound was the site of five major naval battles between August and December 1942, resulting in the loss of over 20,000 lives, 111 naval vessels, and 1,450 planes.
