to be an example of extremely bad behaviour
`This crime plumbs the very depths of the abyss into which it is possible for thehuman spirit to sink,' the judge said.
to find out everything you can about something, including things that are normally secret or hidden
In his writings Shakespeare plumbed the depths of human psychology.
to experience an unpleasant or difficult situation to an extreme degree
They frequently plumb the depths of loneliness, humiliation and despair.