What about the squeezing of the grave for the dead who have not been buried? And will the martyr escape it? And what is the ruling regarding someone who was martyred in the way of Allah and was not yet eighteen years old?

The squeezing of the grave—no one escapes it. It encompasses the old and the young, the believer and the disbeliever. This has been indicated by hadiths, among them the saying of the Prophet, peace and blessings be upon him: "Indeed, for the grave there is a squeeze. If anyone were to escape it, Sa'd ibn Mu'adh would have escaped it." Similarly, the martyr receives his share of the grave's squeeze, but he is not put to trial within it. And whoever is not buried receives his share of the grave's squeeze and the punishment of the barzakh (definition).