People get into this when their boat is sinking.
lifeboat
You should wear this when you go in a boat.
life jacket
You usually see this when there is a fire.
smoke
This means that there is a serious, dangerous situation.
emergency
This is a practice for what to do if there is a fire
fire drill
This vehicle comes when there is a fire.
fire engine
This is a test to learn something or see if an idea works
experiment
This vehicle comes when your boat is sinking.
rescue boat
This is the noise you hear when there is a fire.
alarm