I go through waves, not quite a sea. I look for more, hope to find none. If my job were done, so would be carelessness. Who am I?
EDIT: due to the puzzle being vague, I have closed this down.
A fire man is correct, Waves of flame, I hope not to find any, carelessness is the cause of several fires.
I'm sorry for this one being a flop! I will make a more 'direct' puzzle next time.