This is a very open ended question. The British Sub Aquatic Club1 publishes an annual incident report covering accident in their area. This is an excellent report if the question is about the dangers...
Believe it or not, we can die from too little oxygen AND too much oxygen. This concept involves partial pressures. If we first consider using standard air (i.e. 20% Oxygen and 80% Nitrogen): (1 bar =...
There's Alot of dangers in the universe. Our galaxy is on a collision course with another galaxy. Our magnetic field is becoming weak and will soon be vulnerable to solar flares. Black holes....