This video documents a deep-sea mapping and imaging expedition to the wreck site of the USS Astoria, a heavy cruiser sunk during the critical Battle of Savo Island in August 1942 off Guadalcanal. The mission aims to re-image and map the significant site in greater detail, following an initial mapping effort ten years prior.
During the dive, the team observes the physical state of the wreck, noting extensive biofouling (likely due to its shallower depth compared to nearby sister ships) and physical damage that does not entirely match historical damage reports—a common outcome of documenting chaotic naval battles. The expedition provides extensive historical context on the Battle of Savo Island, highlighting how the failure to utilize new radar technology effectively contributed to one of the worst defeats in US Navy history, ultimately leading to the organizational development of the Combat Information Center (CIC). Visual observations include structural components like the bow resting on the superstructure and the deck strewn with shell casings.
USS Astoria Wreck Site: Re-Imaging and Historical Context
0:01 – 0:22: Historical Context and Location: The dive is focused on mapping the USS Astoria, a heavy cruiser sunk in 1942 during the Battle of Savo Island, one of five major naval battles off Guadalcanal resulting in massive losses (20,000 lives, 111 ships).
0:27 – 0:42: Mission Objective: The team is re-imaging and mapping the site in much greater detail; the wreck was previously mapped and briefly imaged 10 years ago.
1:05 – 1:17: Sinking Formation: Astoria, along with USS Vincennes and USS Quincy, were patrolling together in formation in the early morning of August 8th, 1942, when they were attacked.
1:26 – 2:03: Pre-War Significance: The Astoria had an interesting pre-war connection to Japan, having been selected to carry the ashes of the late Japanese ambassador back to Japan as a goodwill gesture. The ship’s commanding officer at the time was Richmond Kelly Turner (later a key figure in the Guadalcanal campaign).
2:04 – 2:20: Initial Wreck Observations: The wreck exhibits noticeably more biofouling than the previously surveyed USS Vincennes, possibly due to its shallower depth (150–200m higher than the Vincennes).
2:44 – 3:17: Damage Report Discrepancies: The actual damage and structure observed on the wreck do not always align with historical damage reports, which the crew attributes to the chaos of battle and difficulty piecing together information post-event.
4:10 – 5:18: Battle of Savo Island Overview: The battle followed the Guadalcanal landings (Operation Watchtower, Aug 7th). Japanese forces (under Mikawa) surprised and attacked two groups of US/Allied cruisers; all three ships in the northern group (Astoria, Vincennes, and Quincy) were sunk.
5:27 – 6:20: Lessons Learned (Key Takeaway): The sinking was a major defeat for the US Navy. Commanders failed to effectively utilize new radar technology (e.g., USS Chicago feared transmitting radar would reveal its position). This failure emphasized the need for better information processing and dissemination, leading to the creation of the Combat Information Center (CIC).
6:24 – 7:06: Structural Observations: Noteworthy visual elements include a piece of the bow sitting on top of the main wreck structure, the deck strewn with shell casings, and extensive sea life observed within the gun barrels of Turret 3.