The 2016 Rio de Janeiro Olympics have started under a thick film of raw sewage. Corruption investigations are underway into Olympic water treatment projects that used federal money.

• Swallowing more than three teaspoons of water from Rio has a 99% chance of making someone violently ill.

• Money was set aside for water treatment projects, but it mysteriously disappeared.

• Athletes will be forced to compete in these conditions.

• Tourists are also in danger, particularly on two of Rio’s most famous beaches.