Abstract: An apparatus and method for retaining a seismic cable connector module to permit in-water repair of seismic cables. A clamp is supported by a vessel positioned over the submerged seismic cable. The seismic cable is raised above the water surface, and the clamp is attached to the exterior surface of the connector module. The clamp can include a lock for securing the connector module, and a swivel between the clamp and the vessel can permit movement of the connector module relative to the vessel as the vessel heaves due to wind and wave action. The clamp can release the connector module if the environmental forces acting on the connector module exceed a selected amount. The clamp can be attached to a separate vessel for in-water use or can be attached to the vessel deck. A clasp within the exterior surface of the connector module is detachably engagable with a clamp supported by the vessel.