Bathroom remodel vent pipe relocation’s

[JohnB123!]

Hello
I am remodeling a bathroom in my house. The bathroom had a tub and separate shower separated by a false wall. They will be replaced with a steam shower. Inside the wall are water lines and vent lines. I am planning on moving the water supply and vent pipes to accommodate the walk in steam shower. To get a sense of what I am up against I took my scope and put it under the sub floor. I discover that the inside vent tube is capped off below the subfloor. Does anyone know why that would be?

 

[Jeff H Young]

No reason to have that pipe it does nothing (based on your info) but it does make you wonder why , you say subfloor so if there is a crawlspace get under there and look