Deletion on BTRFS - how does it work

[Alex Shashkov]

I'm trying to understand how deletion works on BTRFS. Let's say
directory containing files and other directories gets deleted. What is
essentially happening during this action, what strucutres get updated,
what artifacts remain after the deletion, is it possible to find them
and recover deleted objects, if yes, then how? Thanks in advance!
-- 
Alex Shashkov