A method for rapid containment and intervention of a subsea well blowout on a seabed, wherein the method comprises: a. disconnecting a riser and a connected lower marine package system from the subsea well after the blowout has occurred; b. moving a mobile offshore drilling unit a short distance away from the subsea well; c. pulling the riser and the connected lower marine package system onto the mobile offshore drilling unit; d. modifying a lower marine riser package into a lower marine riser package capping system using common existing equipment; e. running the lower marine riser package capping system on a drill pipe to an initial position near the seabed, wherein the lower marine riser package capping system on the drill pipe is vertically positioned above a blowout connector of a blowout preventer connected to the subsea well blowout in the initial position, in the initial position the lower marine riser package capping system on the drill pipe is offset horizontally from the blowout connector of the blowout preventer; f. moving the mobile offshore drilling unit over the subsea well to operatively align the lower marine riser package capping system with the blowout preventer; g. operatively engaging the lower marine riser package capping system with the blowout preventer; h. allowing an effluent to flow through a first flow path in the lower marine riser package capping system when the lower marine riser package capping system is engaged with the blowout preventer; i. allowing the effluent to flow through a diversion flow path in the lower marine riser package capping system; j. stopping the effluent from flowing through the first flow path of the lower marine riser package capping system; k. observing diversion of the effluent flow and pressure through the lower marine riser package capping system; l. closing off at least a portion and/or blanking off the diversion flow path; and m. pumping fluid into the subsea well to kill the subsea well blowout. a. disconnecting a riser and a connected lower marine package system from the subsea well after the blowout has occurred; b. moving a mobile offshore drilling unit a short distance away from the subsea well; c. pulling the riser and the connected lower marine package system onto the mobile offshore drilling unit; d. modifying a lower marine riser package into a lower marine riser package capping system using common existing equipment; e. running the lower marine riser package capping system on a drill pipe to an initial position near the seabed, wherein the lower marine riser package capping system on the drill pipe is vertically positioned above a blowout connector of a blowout preventer connected to the subsea well blowout in the initial position, in the initial position the lower marine riser package capping system on the drill pipe is offset horizontally from the blowout connector of the blowout preventer; f. moving the mobile offshore drilling unit over the subsea well to operatively align the lower marine riser package capping system with the blowout preventer; g. operatively engaging the lower marine riser package capping system with the blowout preventer; h. allowing an effluent to flow through a first flow path in the lower marine riser package capping system when the lower marine riser package capping system is engaged with the blowout preventer; i. allowing the effluent to flow through a diversion flow path in the lower marine riser package capping system; j. stopping the effluent from flowing through the first flow path of the lower marine riser package capping system; k. observing diversion of the effluent flow and pressure through the lower marine riser package capping system; l. closing off at least a portion and/or blanking off the diversion flow path; and m. pumping fluid into the subsea well to kill the subsea well blowout.