A "faint dimple on the water" typically indicates that something is under the water. Here's why:
1. When an object or something disturbs the surface of the water, it creates a slight depression or dimple on the surface.
2. This phenomenon can occur when something is submerged or moving just beneath the water's surface, causing a small indentation or ripple.
3. The phrase "faint dimple on the water" suggests a subtle disturbance, implying that the cause of the dimple is not overt or easily visible.
4. In contrast, if someone is swimming in the water, the disturbance caused by their movement would likely be more noticeable than a faint dimple.
Therefore, based on the context provided, the most plausible explanation is that a "faint dimple on the water" indicates that something is under the water.
