a toy object such as a submarine or the like with a ballast chamber and an air chamber dimensioned such that normally in a static position the body floats in water with only a small portion of the body extending out of the water . the ballast chamber is filled with water and the air chamber is buoyant and causes the top object to float . diving planes extend outwardly from the body such that when a motor is activated the toy moves forward , submerges and stays submerged so long as there is forward motion . when the motor stops the toy object rises to its static position .