How to make a RC robot which can move on land and water

Here is an easy to make remote control robot which can move on land as well as on water. It can move forward, backward, can take turn.
To make the control system you can use any of the process from following:

1)Wire Control:
See this video to know how to make it.
https://www.youtube.com/watch?v=eCbN-V65Qp8&list=PL2-UtKp9n5G4hFRcJc4WtAxbLgo8H-5bl&index=25

2)RC from old toy:
https://www.youtube.com/watch?v=ONVyiMtsvcU&list=PL2-UtKp9n5G4hFRcJc4WtAxbLgo8H-5bl&index=19

3)Arduino based mobile app controlled remote via Bluetooth:
https://www.youtube.com/watch?v=u9DsWjICE2g&list=PL2-UtKp9n5G4hFRcJc4WtAxbLgo8H-5bl&index=41
In this vide I have used the 3rd process.
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