Screen Door On A Submarine

What does "a screen door on a submarine" mean? How is the saying used?

This isn't a common saying, but it makes sense as part of a metaphor, simile, or analogy.

A screen door is a door that has a screen to allow air to come into the house, even when the door is closed. Here's a picture of one on the side of my garage. The pic was taken right after the door was installed, so there's some trim missing around it:

There is a regular solid door behind the screen door. When I want to allow fresh air to come in on a nice day, I can open the steel door and keep the screen door (also called a storm door) closed. That way, fresh air can come in, but insects and animals can not. Screens on doors and windows are pretty popular where I live, but they are not used at all in some places. When my mother-in-law came to visit from Poland, she was really impressed with screens. She had never seen anything like them in her life.

A is a vessel that goes underwater. Here is an image from the Wikipedia article linked in the previous sentence:

Now that you know what those two items are, it shouldn't be too difficult to understand why you wouldn't want or need a screen door on a submarine.

You could use it in a sentence to describe something that is a really bad design or useless. You could also use this phrase when talking about assigning a person to the wrong job (he's good at __, but wouldn't be any good for __, just like a screen door is nice on your house but not on a submarine) or using the wrong tool for a job.

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  • - Visit turtle s house
  • - Join octopus on her picnic
  • - See who is riding the mysterious elevator
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    • The cheapest retractable screen doors can be purchased on Amazon. There are several sorts available so it is really a choice of what width is wanted and what price someone is willing to pay.