RedactedNarrative: On Friday August 26, 2016 at approximately 10:30 AM, two people were onboard a 53 foot Hatteras named the Fog Cutter. They had left Venice that Friday morning and were headed to the North Shore of Lake Pontchartrain. While running in Breton Sound in approximately 20 feet of water, the vessel struck an unknown and unplotted submerged object. Major damage was done to the underside of the vessel including prop damage, strut damage and total loss of the port rudder. The vessel took on water and sank in approximately 10 minutes. The two people on the vessel were able put on their PFD's and get into a life raft.  They were picked up by a good Samaritan. Alcohol and drugs are no a factor in the accident.