Treasure Hunt

Controls: 

Boat - WASD / Arrow keys to move the boat; Space  to drop a sonar device.  When you find treasure, Z to dive at the spot.

Sub - WASD / Arrow keys to control the sub; B to return to the boat.

Treasure Hunt - Entry for Ludum Dare 48 (https://ldjam.com/events/ludum-dare/48/treasure-hunt) (theme: Deeper and Deeper).

Has a bit of a puzzle element to the main game.  

Use space to drop sonar devices to search for treasure.  The number displayed by each device is the distance to the nearest treasure.  When you find a treasure, use Z to launch the sub and dive deeper and deeper to retrieve the gold!

Can you find all three treasures?