National Harbour

Photo No. 25. Photo No. 25. General View of one Section of the Works, showing two of the Diving Bells. Each Bell measures 17 ft. by 10 ft. by 6 ft. 6 in. high and weighs about 35 tons

Photo No. 26. Another view showing a 45-ton concrete block being lowered into position. After the Sea bed has been levelled and prepared by Diving Bell men, the concrete blocks are set in place by Helmet divers. One of the Helmet divers’ boats can be seen in the foreground.