From the introduction:
In 1997, TSR published the adventure named Sea of Blood for Advanced Dungeons & Dragons (2nd Edition). It was written by Bruce R. Cordell and illustrated by Jeff Easley and Arnie Swekel. It consisted of a 64 page book with maps. Sea of Blood was the third adventure in Sea Devils.
This conversion guide allows DMs to run the original module with 5th Edition rules and provides a reference sheet for encounters.
To use this conversion guide you will need a copy of Sea of Blood.