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The ship had been inspected last year in Chile when a broken pressure gauge was replaced.

A faulty pressure gauge for the fuel heaters was identified but fixed before the vessel left the port, according to authorities.

About 5,000 gallons went into the concrete vault that houses the pressure gauges, until it began to overflow and run down a slight slope into a channelized portion of a salmon stream below.

To calculate how much water seeps underground, they use stream and pressure gauges, as well as thermal probes inserted into the shallow soil at the bottom of the basin.

Check the pressure gauge regularly and recharge or replace it as needed.