Synonyms to bolt hole

asylum, back door, back stairs, back way, cache, concealment, corner, cover, covert, covert way, coverture, cranny, cubby, cubbyhole, dark corner, den, dugout, ejection seat, emergency exit, escalier derobe, escape hatch, escape route, fire escape, foxhole, funk hole, hideaway, hideout, hidey hole, hiding, hiding place, hole, inflatable slide, lair, life buoy, life net, life raft, lifeboat, lifeline, niche, nook, recess, refuge, retreat, sally port, sanctuary, secret exit, secret passage, secret place, secret staircase, side door, slide, stash, undercovert, underground, underground railroad, underground route