In the church crypt, there are 2,425 people interred, including Johann Mattheson and Carl Philipp Emanuel Bach. The grave chambers are deeply excavated for four coffins above the other. During the French occupation of Hamburg in 1813, burials were banned within the city and therefore also in the crypt. In 2004, some of the graves were opened and documented by scientists. In the process, they found some less well-preserved coffins and several intact coffins containing skeletal remains and well-preserved garments and textile upholstery. In the 18th and 19th centuries, wealthy families in Hamburg, fraternities, government offices and those with the benefit of burial funds acquired graves here. Well-preserved coffin carts can still be found in the crypt today. In the days when people were still buried in the crypt, the carts were used to transport the coffins. During the Second World War, the crypt was used as a shelter. In early 2000, the crypt was renovated and is now used for church services and concerts.