Minecraft wiki entry for Water_ladder, associated text: It was possible to make a hidden water ladder, but this was also affected by the Beta 1.6 bug-fix. To construct one, build your water shaft normally except put dirt or cobblestone where you would normally put the ladder. Then, move one space sideways, and dig a shaft upwards there. Face the corner where the water is and press up. Voila! Now hide your water source blocks and you're done. Using his method you can remove the usage of signs or ladders, but also makes it difficult (not impossible) to go downwards without damaging yourself, so this type is ideal for one-way up shafts. The other downside is that it only works when it is facing southwest (user facing the ladder).