Q: What does "from the school, deep into the grounds" mean here? I am wondering what "from the school, deep into the grounds" means in the following sentences:

'Survival?' Hannah turns to him.
'This game we used to play at school,' Femi explains.
Duncan's wife Georgina chips in: 'Oh God. Duncan's told me stories
about it. Really awful stuff. He told me about boys being taken out of
their beds at night, left in the middle of nowhere—'
'Yeah, that's what happened,' Femi says. 'They'd kidnap a younger boy
from his bed and take him as far as they could away from the school,
deep into the grounds.'
'And we're talking big grounds,' Angus says. 'And the middle of
nowhere. Pitch-black. No light from anything.'
'It sounds barbaric,' Hannah says, her eyes wide.


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*Lucy Foley, The Guest List, Chapter 15

The speakers are at the rehearsal dinner the day before the wedding between Jules and Will. The ushers all went to the same public school as Will, and they are now remembering the game they used to play at school, which is called "Survival." (The narrator here is Johnno.)
I looked "grounds" up and found that it means the ground surrounding the school, i.e., the land inside the fence of the school, but I am confused because they took younger boys "from the school" and "deep into the grounds."
I guess I am confused because I am thinking that "grounds" are included in the "school."
Would it be perhaps right to understand that they took the younger boy to a place far "from the school building itself" all the way to the place "deep into the land that the school owns"...? Or, would that perhaps mean they took the boy out of the school entirely and hid the boy somewhere in a nearby region...?

A: "Grounds" is a term used to refer to any piece of land, either owned by someone or belonging to an organisation. It is often used to refer to a piece of land associated with a building, for example the 'school grounds' would be the land on which a school sits and any that surrounds it.
"Away from the school, deep into the grounds" could mean either:

*

*Completely off the school premises and into some other grounds, perhaps previously referred to by the writer.

Or, more likely:


*Away from the school buildings, and into the furthest reaches of the grounds that surround the school.

The wider context ought to make this clear.
