need help guys. thanks

[pressure_cooker]

good day MFK'ers i have a question on how to build a DIY plywood pond, i was planning to build a plywood pond which has a measurement of 8 feet long, 2 feet wide and 3 feet deep. My question is what is the thickness of the plywood i should use, what is the thickness of the pond liner and how much is the pond liner? Thanks guys