A fact from Coatzacoalcos Underwater Tunnel appeared on Wikipedia's Main Page in the Did you know column on 29 January 2018 (check views). The text of the entry was as follows:
Did you know... that the Coatzacoalcos Underwater Tunnel, which took 13 years to complete, has been described as a "monument to corruption"?
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"at a cost of 5.398 billion pesos — a 256% increase "
It's a 156% increase from 2.065 billion pesos to 256% of the original cost.
The source article seems to make this mistake as well but I don't trust my knowledge of Spanish enough to be sure if the distinction is made between those two points.
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