also included work on a deteriorating foundation (due to uneven sinking into the ground) and problems with the towers. The Altars of Forgiveness and of the Kings were subject to extensive cleaning and restorative work. To replace the lost portions on the Altar of Forgiveness, several paintings were added; Escape from Egypt by Pereyns, The Divine Countenance and The Martyrdom of Saint Sebastian. The organs were dismantled with the pipes and inner workings sent to the Netherlands for repair, while the cases were restored by Mexican craftsmen with work lasting until 1977. Reconstruction of the choir area began in 1979 using the same materials as existed before the fire. In addition, any statues in the towers that received more than 50% damage from city pollution were taken out, with replicas created to replace them. Those with less damage were repaired. Some interesting discoveries were made as restoration work occurred during the 1970s and early 1980s. 51 paintings were found and rescued from behind the Altar of Forgiveness, including works by Juan and Nicolas Rodriguez Juarez, Miguel Cabrera and José de Ibarra. Inside one of the organs, a copy of the nomination of Hernán Cortés as Governor General of New Spain (1529) was found. Lastly, in the wall of the central arch of the cathedral was found the burial place of Miguel Barrigan, the first governor of Veracruz. Late 20th-century work The cathedral, along with the rest of the city, has been sinking into the lakebed from the day it was built. However, the fact that the city is a megalopolis with over 18 million people drawing water from underground sources has caused water tables to drop and the sinking to accelerate during the latter half of the 20th century. Sections of the complex such as the cathedral and the tabernacle were still sinking at different rates, and the bell towers were tilting dangerously despite work done in the 1970s. For this reason, the cathedral was included in the 1998 World Monuments Watch by the World Monuments Fund. Major restoration and foundation work began in the 1990s to stabilize the building. Engineers excavated under the cathedral between 1993 and 1998. They dug shafts under the cathedral and placed shafts of concrete into the soft ground to give the edifice a more solid base to rest on. These efforts have not stopped the sinking of the complex, but they have corrected the