Sorry about the map - linked the wrong image! It should be fixed now.

Morning 001
Hour 1: V.Q.21 -> V.P.19

In spite of it being low tide, the cave is still submerged enough that Randvi will have to swim in order to explore it, forcing her onto a much-harder-to-navigate ocean tile.

Hour 2: V.P.19 (oysters)

It's incredibly dark in here; seeing more than a dozen meters into the cave is basically impossible without a light source other than the rising sun outside, giving the illusion of a dark, flooded pit to nothingness going nebulously southeast. While Randvi does not see any signs of human activity in her search, she does have plenty of fish tickle her toes, and a cluster of oysters exposed in the low tide near the entrance are easy to pry away if she wants them.

Randvi has 6 hours remaining before Day 001. If the tide was at its lowest when she woke up, it's likely to be at its highest in 4 hours, and will start to noticeably rise in 1 hour. Based on how the water drips down from the ceiling, being in here when that happens is a risky business.