get to the bottom of

“We want to get to the bottom of it,” Roberts said.

“Obviously the guys that are in there, there’s a reason, and you’ve got to do your best in a short amount of time to get to the bottom of that.”

When they're in close-ups on screen, you would never get to the bottom of them.

"This is clearly a controversial matter and our ministers will use their position at the executive table to not only get to the bottom of how the decision was made but put a marker down that public money cannot be used to further Sinn Féin's pet project," the DUP leader said.

"It's embarrassing. We're going to get to the bottom of it."