-- They stopped here.
- What is this hole?

- It's very small but large enough to hide two people...

-- Boss, the footprints continue along the trail, but this time in only one way.

- The trail runs along the shore. If the probe didn't find them, they must have left the trail somewhere.

-- Ah! Of course! Rock everywhere! ...It is clear now, we will never find where they might have left the shore.