Nicholas Owen designed ingenious priest holes by creating architectural illusions in walls and spaces so that priests could hide in the large homes of wealthy Catholics without detection - sometimes for several days during a home inspection by investigators. The English authorities even punched poles into walls and measured crawl spaces, suspicious of hiding priests. Nicholas Owen also designed a successful escape plot for two Jesuit priests held captive in the Tower of London!
Saint Nicholas Owen was tortured to death and received a martyr's crown in 1606.
Read about priest holes on Wikipedia.