Abstract: A gasket insertion apparatus and method for inserting a fluid sealing gasket between the bolted connection flanges of adjacent underwater pipe line segments is provided. The gasket insertion apparatus includes of a flat frame having an inner peripheral surface and an outer peripheral surface. The inner peripheral surface of the frame has a plurality of angularly cut teeth. The gasket is mounted within the frame and is held in place by the plurality of angularly cut teeth. The gasket insertion apparatus has a handle with an open geometric ring-shaped grip that is configured so that the gasket insertion apparatus may be gripped by a manipulation arm of an underwater remotely operated vehicle and/or by a diver. The apparatus, with gasket attached, is brought to an underwater location and inserted between adjacent flanges of a bolted flange connection by a diver or an underwater remotely operated vehicle.