What action should be taken when heaving in line?

When heaving in line, it is important to heave in without putting immediate tension on it. This approach allows for a gradual retrieval, ensuring control over the line and minimizing the risk of sudden jolts that could lead to accidents or injury. By avoiding an immediate application of tension, the crew can better manage the line, especially if it is heavy or under load, allowing for adjustments as needed.

While allowing the line to slip through one's hands can create a hazardous situation, and applying immediate tension can lead to unsafe conditions, simply heaving in line without putting it under tension creates a more controlled environment. This technique helps in preventing sudden jerks and allows for safer handling of the equipment involved.