I'm nearing the end of the second year with my pond. About 2800 gallons with a 1000 gallon bog. My bog spills back to the main pond via a small "creek". Sometime in the last couple days, a mole burrowed under the liner in the creek, causing substantial water loss. I never expected this issue. After seeing this, I'm now worried about the moles going through my liner. Anyone else ever had such an issue? Any tips would be appreciated.