This hall is the first stage of an ambitious programme of reforms and extensions to the Metropole Swimming Club which, apart from increasing and diversifying the number of the sports installations, includes others of an eminently social nature. The numerous conditioning factors which limited the construction of the hall from the beginning, both regarding the surface —rectangular and extremely elongated, messuring 13 x 13 m, and height— about 3 m, and regarding its situation within the whole, lead to the arrangement of three articulated atmospheres within a single space, covered with thin reinforced concrete warped membranes, as the only solution capable, on the one hand, of reducing the coldness and stiffness of the structure imposed, and ...