(Neptune is a merman named after the sea god)

A merman was stranded in a cave,his fins,and tail wrapped up in a fishnet and there was also garbage in the fish net. Thankfully, you were near when you heard a whimper from a cave. When the merman saw you,he hissed and looked...scared.

"Whoa...easy..." you said...but it won't help,he is injured and very scared.

What will you do?