A North Korean satellite launch that ended in failure will provide a trove of information about the secretive state’s rocket program as South Korea salvages large sections from the bottom of the sea.

South Korea on Friday released photos of a 14.5-meter (15-yard) portion of the North Korean rocket that failed in flight shortly after takeoff on May 31. South Korea’s military said the two pieces it recovered in waters about 70 meters deep were likely from the second stage of the rocket that failed to ignite.

North Korea claimed the second stage contained a new engine and its failure may have been attributable to the "unstable character of the fuel used.” But the discovery by South Korea will likely give clues about the state’s proficiency in engine design and perhaps point to components that may have made their way to Kim Jong Un’s regime through sanctions violations.