Unearthing WWII-era munitions found off Los Angeles coast

Using a high-tech underwater cam, researchers recognized anti-submarine explosives, smoke machines and boxes of munitions on the sea floor.

Unexpected Findings

Marine scientists exploring the seafloor off the Southern California coast stumbled upon a surprising discovery. Instead of anticipated remnants of chemical waste barrels, the team uncovered an array of World War II-era munitions. 

These included anti-submarine explosives and smoke devices, forming rough lines across the ocean floor, stretching over a mile.

Revelation and Announcement

Researchers Eric Terrill and Sophia Merrifield from the University of California San Diego Scripps Institution of Oceanography revealed the findings of their underwater survey conducted in April last year. 

The discovery challenged prior beliefs about the seafloor, initially presumed to contain discarded chemical waste.

Surprising Encounter

Dr. Terrill expressed astonishment at the unexpected findings, initially anticipating remnants of barrels along debris lines but instead encountering various objects unrelated to chemical waste.

Concerns and Unanswered Questions

The researchers highlighted concerns about the lack of clarity surrounding the seafloor near coastlines, emphasizing the uncertainty stemming from the findings.

Survey Methodology and Detailed Analysis

Using sonar technology, the team mapped a significant 135-square-mile area of the ocean floor and captured 300 hours of high-definition video footage. 

Collaborating with the U.S. Navy Supervisor of Salvage, they utilized military-grade technology typically used for locating downed planes, enabling a detailed and clear mapping of the ocean floor.

Munitions Uncovered

The discovery encompassed boxes of munitions, Hedgehog and Mark 9 depth charges, and Mark 1 smoke floats – items used in naval combat. 

The similarity in appearance between some of these munitions and barrels previously used for industrial waste disposal raised initial doubts, later confirmed through underwater archaeology expertise and video imaging.

Significance of the Findings

The revelation not only challenges preconceptions about the seafloor but also underscores the need for further investigation and understanding of the ocean’s history, especially in coastal regions.