When someone says shrouded in ever-greater secrecy what does it suggest?

Answer 1

The implication in the statement is that there is something that a person or group wants to keep secret. As time passes layers of protection of that secret are applied thereby making it harder and harder to get to just as if someone were laying shrouds upon themselves to protect them from an ever increasing cold. In order to get to that person you would need to remove each shroud down to the person just like you need to remove each layer of protection to get to the secret.

Answer 2

why is careful planning essential when treasure hunting?

Answer 3

Well maybe you could say you dig out the secret