Rene Meulensteen's men are bottom of the table, four points adrift of safety with just 14 games remaining to haul themselves clear of the drop zone.
Hangeland said: "We are going through a very tough time. I hope this is rock bottom because there's only one way up from here.
"Everyone can be rest assured there will be no stone left unturned in the quest to resolve this. We need to work extremely hard to put our form right and start getting results.
"It's about character now and who's up for the fight. There's a lot of good guys in the dressing room who really care about this, so I'm hoping we have enough."
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