Stop Four: Ceramic Game

See pieces of ceramics lying at the bottom of the river? Your task is to get any piece out of the water with help of the ship. And the rules: 

(1) Use to control the ship moving forward and backward. 

(2) Use to control the net going up and down.

(3) Any piece you got must be sent to the Connoisseur’s for an academic judge.

(4) And the most important is: when moving up with the piece inside, your net could not touch any of the swimming creatures. 

Now begin your exploration!