Are those who drowned on the ferry considered martyrs, and how is the funeral prayer performed for those whose bodies have not been found?

All matters are in the hands of Allah, and calamities may be for elevating ranks or expiating sins. When afflicted by a calamity, one must be patient and say: "Indeed we belong to Allah, and indeed to Him we shall return. O Allah, reward me in my calamity, and replace it for me with something better." Whoever dies by drowning is a martyr, and whoever survives should praise Allah for their well-being and strive to do good in the remainder of their life. The drowned person who is found should be washed, shrouded, and prayed over. The funeral prayer in absentia should be performed for those who are not found.