RedactedNarrative: V-1 TROLLING IN GULF OF MEXICO and started taking on water for unknown reason, faster than bilge pump could remove. V-1 eventually went down, stern first. All occupants put on life jackets and exited V-1 as V-1 disappeared sinking out of sight. Another vessel, FL 3366 GR, was nearby and picked up all occupants from V-1 and returned them to the residence of departure. No injuries occured.  no information as to cause of taking on water, vessel still submerged.