Talking is not communication of the other person thinks you mean something other than what you do mean. Take this safety alert from Marine Safety Forum:
A PSV was carrying out a routine operation of loading fresh water at the quayside. During the bunkering process the duty AB reported that the water hose was showing signs of damage and was leaking heavily. The Officer on duty then stopped the water delivery, shut down the system and called the quayside requesting that the water men come and change out the hose.
After the hose was changed out and the duty AB tied up the hose in an effort to ensure that it would not get damaged against the ship’s hull. He then asked the waterman if ‘this is ok?’ meaning was the water man satisfied with how the hose was secured. The water man assumed that the AB meant that it was ‘ok’ to turn the water on again, which they did.
At the same time as the water men turned the water back on the AB called the bridge to inform the duty officer that the hose was connected and the water valves could be opened up again. Before the duty Officer had time to open the ships valves back pressure had built up in the hose on the quayside and caused the hose to part at the ’wire seizing’ collar connecting the hose to the camlock coupling between the hose joints on the quayside.
The hose parted with force causing the ‘ships end’ of the hose to whip on board and strike the AB on the chest area.