Lecture 13 - Diving and underwater investigation Flashcards
What type of diving is recreational and does not require training?
Snorkeling
What type of diving requires some training an oxygen tank?
Scuba diving
What is required for technical diving?
Extensive training and different types of gases for safe ascending and descending
What is done in apnea diving?
Hyperventilating before the dive to increase amount of oxygen in the lungs
What happens to pressure and the lungs during descent?
Pressure increases and lungs compress
What happens to pressure and the lungs during ascent?
Pressure decreases and lungs decompress
At what depth does pressure double?
10m
What are the risks of deep diving?
Ascending/descending too quickly
What is decompression sickness and how does it occur?
Pulmonary barotrauma occurs by ascending or descending too quickly. Results in an air embolism and the formation of nitrogen bubbles in the blood
What happens when fresh water enters the lungs?
It is absorbed into circulation, diluting blood and causing red blood cells to swell and rupture, releasing potassium
What happens when salt water enters the lungs?
Water diffuses through the alveoli from the blood to the lungs by osmosis. Blood thickens and circulation is slowed.
What is done in body recovery to prevent the loss of evidence?
Body is bagged underwater and location and depth is marked by buoy
How are weapons and metal objects collected?
Collected in special containers to prevent rusting
How are heavy objects collected?
Lifted using cranes, tow trucks or air filled bags
What are the external indicators of a drowning?
Foam around nose/mouth, wrinkled skin, debris/mud in mouth, abrasions on hands/feet
