Depends on where you are. Often its shrimp. Could be fish feeding on coral. If you are in California in the spring you might be hearing Garabaldi guarding his nest. Sound travels much further under water. What you hear in Tropical and sub tropical waters is fish,shrimp and other forms of sea creatures. In colder fresh water, you do not hear the same volume of sounds .
Could be shellfish, fish, lobsters, rocks (moved by waves)
The crackling sounds are usually made by snapping shrimps.
Rustling.
the batterys are probrably crackling, check your wiring
The cracking noise is the tip of the whip breaking the sound barrier
You create friction when you take off your clothes. The crackling sound is the static electricity.
It makes the sound travel further
Crack is in a rocklike form and it smoked. The name crack comes from the crackling sound it makes when it is burned
a crackling noise
To make it crackle.
yes
That crackling sound is your hard drive being read, and it can be fixed by replacing your hard drive with an expensive Solid State Drive.