Why do things sink or float? Tub Sub knows.
As a boat, it floats. As a sub, it sinks.
For a floating boat, push the flexible blue part down.
For a sinking sub, pull the blue part up and fill the bottom with water. Only the periscope (also a handle) will stay above the water.
Encourage thinking and reasoning
Suggested Age: 12m +
This product has not yet been reviewed.