The Chapres Incident was a standoff between the French Empire and Chinese Empire in April 1993, when the submarine VNI Chapres of the Marine Imperiale entered Chinese territorial waters and encountered a contingent of fellow Chinese ships and submarines off the southern Chinese coast. The Chapres, using a new experimental satellite tracking system, was in fact hundreds of miles away from where the satellite said they should have been - namely, off of the Mekong delta, which caused confusion.