 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 . 
 The cathedral , along with the rest of the city , <a href='uninflect' title='1'><mark>has</mark></a> been sinking into the lakebed from the day it was built . However , the fact that the city <a href='drop_aux' title='2'><mark>is</mark></a>a megalopolis with over 18 million people drawing water from underground sources <a href='been_done' title='3'><mark>has</mark></a> 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 <a href='uninflect' title='4'><mark>were</mark></a> still sinking at different rates , and the bell towers <a href='uninflect' title='5'><mark>were</mark></a> 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 . 
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