<prompt> Translate the following text to SwahiliStairs in the nave lead down to the crypt and St. Franciss tomb, rediscovered only in 1818, centuries after it had been concealed from Perugian plunderers.  <response>: Mstari wa chini katika nave inaongoza chini ya crypt na kaburi la Mtakatifu Francisko, ambayo iligunduliwa tu katika 1818, karne baada ya kufichwa kutoka kwa waporaji wa Perugia. 