if you set a grenade off underwater how big will the explosion be?

Question: if you set a grenade off underwater how big will the explosion be?
- Keywords:
  dangerous,
  explosion,
  water
Asked by wear45den to Souvik, Sabine, Maria, John, Faye, Armin on 21 Nov 2019.
- Souvik Kundu answered on 21 Nov 2019:
  
  It’s very hard to say without knowing the power of the grenade and all. But it will explode and can cause severe damage as well.

Question: if you set a grenade off underwater how big will the explosion be?