 The barrel vault in the eastern part of the cloister features lunettes but no belt bows; the vaults in the south and west wings are supported by belt bows and ogival arches (built in the second quarter of the 13th century).During the Second World War the cloister, which had been walled towards the courtyard, served as an air raid shelter.The belfry in the southwest tower houses a ring of six cast steel bells, one of the Bochumer Verein's best works.