Corrected entry: You can't swim in petroleum. The human body is much denser (and thus, would sink like a brick) when you would try to swim in it. Not only that, but the fumes above it are toxic, so you would also die of poisoning.
Friso94
21st Jul 2013
Indiana Jones and The Last Crusade (1989)
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Correction: Yes, the human body is more dense than petroleum, however it doesn't necessarily mean you'll sink like a brick. You also need to take into account a person's body mass, fat distribution, and lung capacity, all of which make it possible to swim for short periods of time in oil. As for the inhalation of the fumes, the toxic effects are not likely to manifest immediately. People have been purposely inhaling gasoline, glue, aerosols and other hydrocarbons for years, and it takes long term exposure to cause death.
rswarrior
Although, any ingestion of petroleum can cause immediate affects, such as nausea, vomiting, dizziness, and it would intensely burn your eyes if you got any in them. Speaking from experience.
They were in Venice. It is likely the tunnel was at or below water level. The petroleum is able to float on the surface of water. It is possible they would be able to swim underneath the layer of petroleum.