We used a SS316L pressure casing for an underwater measurements which consists of lithium metal batteries and data acquisition system.The system retrieved after one year of data collection.Brownish colour water was found at the bottom of the casing when it was opened.we did not carried out any vacuum or purging.The amount water found out may be 1liter. what could be the reason for the water entering to the casing. No leakage found out from the flange or sealing or any other side.
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