What are the mandatory equipment pieces for the KM-37?

The mandatory equipment for the KM-37 includes essential components that facilitate safe and effective underwater operations. This set of equipment typically consists of a helmet, which provides protection and allows for communication; a harness, which secures the diver and connects them to the rescue system; and an umbilical, which is crucial for supplying breathing gas and other vital services during the dive.

These items are necessary for maintaining the diver's safety and ensuring that they can perform their tasks efficiently. The helmet serves not only as protective gear but also as a communication device, which is vital in rescue scenarios. The harness ensures that the diver remains secured, especially in dynamic underwater environments. Meanwhile, the umbilical is essential for transporting life-support resources, making it imperative for any deep-sea rescue operation.

In addition, other choices either underestimate the required equipment or include items that are not mandatory for the KM-37 operations, demonstrating why the correct answer specifically focuses on this critical trio of equipment.