The River Siene in Paris is a popular place for suicides and body disposals. In 2007, they found 55 bodies. In the following 6 years, 306 bodies were found, the most in one day being 16.
The bodies were kept by the Cathedral, so that families might identify them.
This particular song was based around one particular body, one of the sixteen. It was a woman's, and she had a smile on her face. Something drowning victims shouldn't have.
The last three minutes simulate the drowning.