Loss of Communication, but still have video w/BR

loss communication with BR. During dive we lost communication with BR, but still had video.
The gripper opened up and we lost all controls. Was using the slim tether changed it back to original tether. when we introduced power we had smoke from the port side coming from power side. camera lights starting flashing. Not sure of all terminology but the board that connects from battery terminal gets HOT. Blue, amber and red light are displayed on pixhawk and a beeping. Other lights flashing from other circuit boards?