Emeline is remembering the worst journey she's had to endure while travelling on a ferry from France to the United Kingdom.
Pay attention to the hints!
Some vocabulary you may want to look up before or during this exercise: "être loin de se douter que...", "une traversée", "le ferry", "un.e tel.le [nom]", "dès", "une gare maritime", "être retardé.e", "en raison de...", "larguer les amarres", "espérer [infinitif]", "une cabine (ferry)", "être sans compter sur", "une vague", "s'écraser contre [quelque chose]", "faire vomir", "tout au long de...", "le soulagement", "un ennui", "en dépit de...", "une gare ferrovière", "manquer un train".
