Crayfish in filter, how to lure it out

[smellyfish]

My newly acquired white crayfish spend one day in open tank decided to crawl into my internal filter.

For those familiar with juwel internal filter system, it is a big internal filter with opening at the top like a ios system. Bugger went in dun come out make me very angry.

Any bro got any good idea how to lure out the bugger? Murder one of my snails some more before fleeing scene of crime. Knn