Meaning of the word "don't think there are no crocodiles just because the water is calm" in English

What does "don't think there are no crocodiles just because the water is calm" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

don't think there are no crocodiles just because the water is calm

US /doʊnt θɪŋk ðɛr ɑːr noʊ ˈkrɑː.kə.daɪlz dʒʌst bɪˈkəz ðə ˈwɔː.tər ɪz kɑːm/
UK /dəʊnt θɪŋk ðeər ɑː nəʊ ˈkrɒk.ə.daɪlz dʒʌst bɪˈkɒz ðə ˈwɔː.tər ɪz kɑːm/
"don't think there are no crocodiles just because the water is calm" picture

Idiom

a warning that just because a situation appears peaceful or safe, it does not mean there are no hidden dangers

Example:
The market seems stable now, but don't think there are no crocodiles just because the water is calm.
Everything is quiet in the office, but don't think there are no crocodiles just because the water is calm; the layoffs are coming.