An underwater house I made. It has

• A wheat farm
  
• A sugar cane farm
  
• A ground sugar cane farm
  
• A ground cactus farm
  
• A big ground wheat farm
  
• A working heated bath
  
• A heating room
  
• A laboratory
  
• A trash can
  
• An observation tower
  
• A shower
  
• A bathroom
  
• A crafting room
  
• A nether portal
  
• An art room
  
• An minecart track outside
  

I made this with too many items but i made it for everyone, you don't have to have too many items

Use the water elevator for going into the heating room so you can get back up

If you need to know how to operate any thing please tell me in the comments