Percy F. Westerman, A Sub and a Submarine: The Story of H.M. Submarine R19 in the Great War
“ Above the faint hiss of the air escaping through the release-valve of his helmet he could detect the rapid threshing of a vessel's propellers. Louder and louder grew the sound. Submarine undulations almost swept the three men from their precarious perch as a swiftly-moving craft passed 60 feet overhead. The suspended net swayed to and fro like a flimsy curtain in a strong draught, while into and beyond the faint halo of light swept the bight of a metallic rope. ”
