Is it permissible to eat meat found on a ship where Christians work, and food is supplied from different countries, and the cook is Christian?

The basic principle concerning slaughtered animals is that they are forbidden until it is known that the one who slaughtered them is a Muslim or a person of the Book, and that the name of other than Allah was not invoked over them, and that they were not slaughtered in a manner other than that prescribed by Islamic law. If you have doubt about the slaughterer, it is obligatory to avoid it. Do not eat from the meat until you know that its slaughterer is someone whose slaughter is permissible, such as if it is imported from Muslim countries or from people of the Book.