How to create an under water house on minecraft

I am going to show you a very good way of making an under water house on minecraft

First find a river or the sea (this can be on any texture pack)

Next build a 8X10 square under the water

Build four more layers on it all the way around

It should look like this

Now do a roof with a 2X2 hole in the middle

After that build a tower on the outside of the hole to the top of the water

Then fill the whole of the inside with blocks

Then destroy all the blocks you filled in the under water house

Last but not least add the ladders,trapdoors,the floor and the decorations

Hope you enjoy your 10 step under water house!!!