Zuhayr reported that one of the Companions of the Prophet, mayAllah bless him and grant him peace, said, "If anyone spends the nighton a flat roof (without walls) and then falls off of it and dies, no onebears any responsibility for him. If anyone embarks on the sea when itis fierce (i.e. stormy) and is destroyed, no one bears any responsibilityfor him."
English reference: Book 48, Hadith 1194
Arabic reference: Book 1, Hadith 1194