You fill the vault.
Medical, legal, home, car, pets, dependents, travel, and the personal instructions nobody else would know. You fill it line by line, or tell NESA's coordinator and it does the data entry.
Your vault is encrypted on your device before it is stored, and we hold no key to it. The emergency layer around it — who your people are, how to reach them, what opened and when — is not encrypted, because a system that has to route help cannot be blind to that. The full list is in our security statement.