How do you you build a under water house in the sims 2?

Answer 1

First you build a foundation like your going to build a house but a very small one. LIttle foundation.

Second: make the ground water then make it deep enough and to were the ground is even.

3. Then build a foundation under the water then stairs to the foundation up above

4. Then build it like a normal house, Your sims can go down there without dying, guarenteed!