John Frederick Fitzgerald De Roos

Chart of the sea floor during salvage operations on the wreck of H.M.S.Thetis John Frederick Fitzgerald De Roos

Chart of the Island and Port of Cape Frio John Frederick Fitzgerald De Roos

Chart of the cove showing the wreck of H.M.S.Thetis John Frederick Fitzgerald De Roos

Diving bell used for salvage operations on the wreck of H.M.S.Thetis John Frederick Fitzgerald De Roos