and experience, and by their ability to recognise, interpret and analyse the available information effectively. Attention is a limited resource, and may be reduced by distraction and task loading. Comprehension of the situation and projection of future status depend heavily on relevant knowledge, understanding, and experience in similar environments and situations. Team situation awareness may be less limited by these factors, as there can be a wider knowledge and experience base, but it is limited by the effectiveness of communication within the team. Diver performance Safety of underwater diving operations can be improved by reducing the frequency of human error and the consequences when it does occur. Inadequate learning or practice of critical safety skills may result in the inability to deal with minor incidents, which consequently may develop into major incidents. Overconfidence can result in diving in conditions beyond the diver's competence, with high risk of accident due to inability to deal with known environmental hazards. Inadequate strength or fitness for the conditions can result in inability to compensate for difficult conditions even though the diver may be well versed at the required skills, and could lead to over-exertion, overtiredness, stress injuries or exhaustion. Peer pressure can cause a diver to dive in conditions where they may be unable to deal with reasonably predictable incidents. Plan continuation bias and the sunk cost fallacy. Normalisation of deviance and practical drift Diving with an incompetent buddy can result in injury or death while attempting to deal with a problem caused by the buddy. Overweighting can cause difficulty in neutralising and controlling buoyancy, and this can lead to uncontrolled descent, inability to establish neutral buoyancy, inefficient swimming, high gas consumption, poor trim, kicking up silt, difficulty in ascent and inability to control depth accurately for decompression. Underweighting can cause difficulty in neutralising and controlling buoyancy, and consequent inability to achieve neutral buoyancy, particularly at decompression stops. Diving under the influence of drugs or alcohol, or with a hangover may result in inappropriate or delayed response to contingencies, reduced ability to deal timeously with problems, leading to greater risk of developing into an accident, increased risk of hypothermia and increased risk of decompression sickness. Use of inappropriate equipment and/or configuration can lead to a whole range of complications, depending on the details. High task loading due to a combination of these factors can result in a dive that goes well enough until something