Updated

A group that's spent nearly 20 years trying to find the wreckage of a World War II-era bomber that crashed into a Pittsburgh-area river is seeking permission to dredge the waterway for wreckage.

The B-25 Recovery Group first told the Pittsburgh Tribune-Review they've asked the U.S. Army Corps of Engineers for permission to dig beneath the Monongahela River near the Homestead Grays Bridge.

The plane, a bomber converted to a training aircraft, was flying from Nevada to Harrisburg when it ran out of fuel and ditched in the river on Jan, 31, 1956. Since the wreckage has never been publicized, conspiracy theories have sprung up about whether it's still in the river or been secretly carted away by the military.

The group believes the plane came to rest in a trench and has been covered by silt.