Minecraft wiki entry for Man-made_lake, associated text: 1 "Hole In the Ground" technique
1.1 How To: Deep Lake w/ Ease
1.2 How To
2 Deep Pool
2.1 How To
2.2 Deep Pool 2
2.2.1 How To
3 Pure Lake
3.1 Bottom up
3.2 Top Down
3.3 Creative Mode or Silk Touch enchantments Only
4 "There are currents!"
5 Swimming in a Lake
6 Taking Water From a Lake