Over 71% of the earth is covered in water and it remains to be unexplored as its expensive to do that. David Land and Eric Stackpole are one of these explorer and treasure hunters who want to explore these oceans, but it was too expensive for them to do that. They decided to make their own low-cost submarine called the Trident. This robot is a cost efficient way to explore the unknown places beneath the ocean. This robot can be controlled with any smartphone, laptop or joystick. It can also be connected to VR headset that makes the exploration more fun. The Trident also sends a live HD feed to the user with a thin cable. This robot can fit in your backpack and it is very easy to use.