Power of punctuation

"Danger! Men working" or "Danger-men; working"?

Brilliant day today. I went to see our power engineers. It is the nearest thing to time travel I've experienced. All their kit is at least 30 years old but it doesn't matter, it still works. I found this sign and fell in love with it. I think it's ace!

My godson was mind boggled. He saw all of that, then had a video meeting with Dallas, Texas. I'm hoping this confirms to him that I'm a pretty cool "G-mom" (as he calls me)