Rubuta ci gaba ga wannan sakin layi - De Neumann ya fara tunanin tunanin yiwuwar tsarin kula da tashar jiragen ruwa yayin da yake kyaftin din HMRC "Vigilant". Waɗannan ra'ayoyin sun biyo bayan la'akari da irin waɗannan abubuwan da suka faru kamar haɗarin haɗari na jirgin ruwa na HMS "Divina" a 1950, jirgin ruwan Norwegian "Baalbek" da ya yi karo da sansanin soja na Nore a 1953, da kuma mummunar ambaliyar Arewacin Arewa
wanda ya haifar da ambaliyar Canvey Island, Foulness da Gabas ta Gabas a 1953. A cikin waɗannan da sauran yanayi, ceto da kuma tattara bayanan sirri sun kasance da matukar damuwa ta hanyar rashin kulawa da kulawa, wanda ya haifar da rashin fahimtar halin da ake ciki.