провалиться мне на месте!(in the novel "The Adventures of Captain Hornblower" by C. S. Forester, the British naval officer Horatio Hornblower says "Blow me down, if that isn't the Acheron!" when he sees a French warship that he thought had been sunk Taras)
не может быть!(is a slang expression that was used by sea pirates and seafarers in the 17th and 18th centuries. It is a way of expressing surprise or disbelief Taras)
