In general, I enjoy research. It's fun, whereas writing is sometimes fun but sometimes sheer hard work. However, it's maddening when the information you need eludes you or is contradictory.
I've been trying to find out about ocean currents in this beautiful bay in North Cornwall:
(that's my sister striding towards the 300' vertical cliff!)
Somewhere in those cliffs is a cave, from which my victim is swept by the current into the inlet on the right of the second photo.
The inlet, Rocky Valley
The main trend of the coast is southwest to northeast, and that's the way the main current flows between low and high tides, reversing between high and low. However, the bay and the inlet face north. Headlands, islets, and underwater rocks divert the currents in unpredictable ways. Maybe there's a lobster fisherman somewhere who knows the details...
On the other hand, what's the likelihood of him reading my book and telling me I got it wrong? Since I don't know the answer, I can make the currents in the bay swirl exactly as I want them.
As a writer of fiction, I have goddess-like powers in my fictional world.