The upper end of the present design is to install a device that enables the freedom to reach the waters penetration due to the hull defect detector in the cargo hold, cargo particles is dense (e.g., cement, phosphate rock, sulfur, coal, etc.) unit detects infiltration waters by freely flowing up (that is, the sensor) is to propose a device for inducing salt damage that does not result in a case such as the alarm sound or not occurred alarm delay to the sensing unit.
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