Why are insulated gloves not necessary for divers during underwater welding?

Insulated gloves are not necessary for divers during underwater welding because water will inevitably enter the gloves, rendering their insulating properties ineffective. When divers work in aquatic environments, such as during underwater welding, the main concern is the potential for electric shock. However, insulated gloves that are designed to protect against electrical hazards do not function well when submerged. The presence of water can conduct electricity, thus eliminating the protective barrier that the gloves provide. This highlights the importance of alternative safety measures to ensure that divers are protected from electrical hazards when welding underwater.

Each of the other options, while they may contain some truths about the limitations of insulated gloves, do not address the primary concern of water conducting electricity. Bulkiness might affect dexterity, overheating can be an issue in enclosed environments, and lack of design for underwater use speaks to functionality rather than safety in the context of electric shocks. Nevertheless, the critical aspect here is that the inevitable presence of water neutralizes the effectiveness of insulated gloves in providing safety against electrical shocks in a submerged environment.