You jet ahead as the beast gives chase! You weave through a wide-open cave where it has plenty of room to move after you. It snaps at the submarine's aft, tearing the hull for 5 damage.
This puts it at 12 damage; that first bite plunged into something vital.
Trozen gives a shout when he sees a smaller cavern to one side!
Denzral will dive into the cave pretty snappy (ironically). "There couldn't be a faster or easier way to travel? Like a short hop around the planet in a ship." Denzral mostly mutters to himself. "Use the submarine they said, go and speak to the Gun-Gun they said..." he continues almost under his breath.
Does the craft have any sort of defences?
You navigate your way through the narrow underwater tunnel, then. The submarine took some limited damage so you are not too nervous when you scrape a few corners when the way on becomes quite tight.
Eventually you emerge into open water, and there is no sign of your beastie.
How do you want to proceed, as far as speed and navigation? Trozen is helping you navigate, of course.