Shipping accidents occur due to collisions (52%), strandings (18%), fire/explosions (9%), sinking (2%) and several less important happenings. Fishing vessels are involved in the most accidents in the North Sea, followed by cargo ships. Tankers and ships with liquid cargos are involved with less than 10% of the accidents at sea. However, materials are readily discharged into the marine environment should an accident occur with this last group. offshore installations also form a source of risks.
These accidents cause an average of three deaths per year and once every other year, there is a substantial amount of damage for the environment. In most of the incidents, an accident is caused by a combination of factors. In 65% of the cases, human failures are (partially) responsible; 50% of the time, technical sailing causes are relevant; 35% of the time, poor weather conditions play a role and in 20% of the time there is a question of deficiencies on the ship and/or in the cargo.
The chance that a ship has an accident in the Dutch section of the North Sea is 1 per 1700 trips. The chance of an oil disaster with more than 30,000 cubic meters of oil is once every fifty years. The chance of an oil disaster with more than 50,000 cubic meters of oil is once every 200 years. Losing control of the wheel occurs an average of 30 times per year in the North Sea. This ships are referred to as drifters. Drifters are dangerous in the navigational lanes and can collide with offshore platforms and offshore wind parks.