Which condition could cause a vessel to drag its anchor?

The condition that could cause a vessel to drag its anchor is strong current or wind. When a vessel is anchored, its stability and holding power depend on factors such as the weight of the anchor, the type of seabed, and the angle of the anchor chain. In conditions of strong wind or vigorous current, the forces acting on the vessel can exceed the holding strength of the anchor.

Under strong current or wind, the vessel is subjected to increased lateral forces, which may cause it to pivot and shift position. If the anchor is not secure or if it's not designed to hold in such conditions, it may not be able to resist these forces, resulting in the anchor dragging along the seabed.

Calm weather does not present these challenges, as the forces acting on the vessel remain minimal, allowing the anchor to remain secured in place. Low tide and shallow water might affect the depth at which the anchor is set or may alter the nature of the seabed, but they are less likely to create the same level of force capable of pulling the anchor from its position as strong wind and currents can.