Fredito b ..... not really clear. My 12-yo-son immediately saw what I saw. The bottom looks a bit like a german nazi sign. Sorry. I'm sure that wasn't your intention, but it really does reasemble ist.
And your submarine looks like a jumping animal. ;-)
It is clear that I am not able to draw what I intend.
My wish was to represent the indication: ?Danger. Sliding pavement for submarines".
And your submarine looks like a jumping animal. ;-)