Some managed to get in by sneaking along another passageway into the building.
Don't sneak away and hide.
Sometimes he would sneak out of the house late at night.
You went sneaking off behind my back!
vt. to sneak a look at sb/sth;to sneak a peek at sb/sth;to sneak a glance at sb/sth：偷偷看某人/某物一眼
He sneaked a look at his watch.
When he didn't answer, she sneaked a glance at him.
He sneaked a cigarette from her open bag.
You even snuck me a cigarette.
After their sneak attack on the capital's main airport was repelled, the insurgents dispersed.