: Development of modern transportation system there are various types of ships are used to transport goods and peoples
from one place to another place. In this process damaged ships are refurnished and welding process is takes place underwater
because of the size and weight of the ship. Major safety concerns in underwater welding are electric shock, exploitation,
drowning, hypothermia, nitrogen narcosis etc., the major hazard in the underwater welding process is nitrogen narcosis. It
occurs majorly due to usage of oxygen cylinder while diving for the repair process.