They should rely less on sight because the deeper you go down the less sunlight the reaches down because it refracts and gets dispersed. So it could be the middle of the day and it would look like the middle of the night down there.
Tsunamis can only occur in water.
The lungs as well as some other parts of the body are attacked by bacterium, causing difficulty in breathing as well as more health problems, Which most likely would result in the outcome of death.
