Abstract: An apparatus and method for forming an opening through a storage tank (3) containing a flammable and/or combustible fluid, for example petrol. The storage tank (3) includes a hollow column (7) extending outwardly from an exterior surface of the storage tank (3), an interior wall of the hollow column (7) in combination with the exterior surface of the storage tank (3) defining a well-like cavity allowing access by the apparatus (1) to the exterior surface of the storage tank (3). The apparatus (1) includes a cutting assembly (13) for cutting through the exterior surface of the storage tank (3); and a housing assembly for supporting the cutting assembly (13). The housing assembly includes a sealing assembly for sealing the housing assembly with respect to the hollow column (7) such that the cavity is sealed from surrounding air.