How do barnacle shells form chemical records of ocean conditions?

What new clue was found in the MH370 mystery?

Last updated: May 4, 2026

Barnacle shells on MH370 debris contain chemical records that scientists decoded to potentially track the aircraft's drift history across the Indian Ocean.

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Discovery location and date	MH370's right flaperon washed ashore on Réunion Island in July 2015
Barnacle science breakthrough	Researchers showed in a 2023 paper that barnacle shell layers preserve chemical traces of ocean temperature, creating a record of drift patterns
Research limitation	The barnacles studied were relatively small, producing only partial reconstruction of the debris' drift path
Potential application	Larger, older barnacles from MH370 debris could reveal drift history farther back in time, potentially toward where the aircraft entered the ocean
Recent search outcome	Ocean Infinity's 2025-2026 seabed search surveyed 7,571 square kilometers but did not locate aircraft wreckage

The Barnacle Discovery

When MH370's right flaperon washed ashore on Réunion Island in July 2015, researchers noticed barnacles had attached to the debris. Unlike traditional sonar or wreckage analysis, these shells offered an unconventional clue. The barnacles had built shells containing chemical traces of the water they passed through, essentially creating a living record of the debris' journey across the Indian Ocean.

How Barnacle Chemistry Works

In a 2023 paper published in AGU Advances, researchers led by Nasser Al-Qattan and Gregory Herbert demonstrated that barnacle shells function as chemical records. As each shell layer forms, its chemistry changes based on the surrounding ocean temperature. In the Indian Ocean, sea-surface temperatures vary significantly across latitude and season. By reading these layers and comparing them with ocean-drift models, scientists could potentially reconstruct the debris' drift history.

Scientific Limitations and Future Potential

The barnacles initially studied were relatively small, yielding only a partial reconstruction of the drift path. However, researchers indicated that if larger, older barnacles from MH370 debris could be analyzed, they might look farther back in time into the drift record. This could potentially reveal where MH370 entered the ocean, making larger specimens crucial for advancing the investigation.

Recent Search Efforts

In March 2025, Malaysia signed a no-fee agreement with Ocean Infinity to conduct a renewed seabed search in a 15,000-square-kilometer area of the southern Indian Ocean. The search ran in two phases from March through January 2026, surveying approximately 7,571 square kilometers of seafloor. However, on March 8, 2026, Malaysia's Air Accident Investigation Bureau announced the search had not yielded findings confirming the aircraft wreckage location.

Ongoing Scientific Investigation

While the 2025-2026 search came up empty, other scientific approaches continue. A May 2024 study in Scientific Reports examined whether aircraft crashes at sea produce hydroacoustic signals detectable from thousands of kilometers away. Scientists found only one potentially relevant signal from underwater acoustic data near the time experts believe MH370 ended its flight, suggesting controlled experiments along the seventh arc could help test this theory.