をあけた

made a hole in …

→ を
phrase Rare #22,573
made a hole in … あけた can also mean “opened,” as in opening a door. を marks the thing affected by the action.
JA: 子どもが紙に穴をあけた。
EN: The child made a hole in the paper.

彼の煙草の火で彼女の服に穴をあけた。

He burned a hole in her clothes with his cigarette.

ねずみが壁に穴をあけた。

The mouse made a hole in the wall.

彼は箱の中身をあけた。

He opened the box and took out its contents.

彼はドアをあけた。

He opened the door.

彼らは壁に穴をあけた。

They drilled a hole in the wall.

彼女はブラウスに穴をあけた。

She put a hole in her blouse.

ネズミがドアに穴をあけた。

The mouse made a hole in the door.