The motor in this pump is a 12V brushed motor, spinning in a sealed air-filled cavity. There is a rubber seal on the motor shaft that keeps water out within reason, but at some depth water will overpower the seal, which will cause the motor to fail. These pumps are popular for ROVs at swimming-pool depths (they produce quite a bit of thrust!), but this isn’t what they were designed for so I wouldn’t count on them running indefinitely. They aren’t too expensive, so you could always swap them out when they fail.
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