There are many things I know how to do efficiently in minecraft....removing large chunks of water is not one of them. I am renovating a public guardian farm I maintain and part of that is removing about 15 layers of water. The area is right next to an outpost so I consider it fairly safe. I will provide a helmet with aqua affinity and Respiration for you to use underwater. I have over two stacks of sponge for you to use as well. PM me or reply here and we can discuss payment. Thanks!