Here's the USCG story. The Coast Guard is currently responding to a distress
call from the 135-foot tugboat, Valour, towing a 500-foot barge loaded with
approximately 140,000 barrels of petroleum by-product 37 miles off the coast
of Cape Fear, N.C.

How do you call a 500ft barge missing? Does that mean sunk?

https://www.piersystem.com/go/doc/586/109280/