Jumping into the water in an unfamiliar place are always dangerous, because we can’t be sure what is really under the surface.
There can be many unseen dangers under the water, for example:
- There may be rocks or other dangerous objects thrown into the water
- Even in familiar places, the landform may have changed over the years
- The water level may have lowered due to heat or some other reason
- The consequences of an unlucky jump may be extremely serious.