If we’re ever going to explore the only celestial body in our solar system with surface bodies of liquid, we’re going to need a sea-worthy vehicle. Luckily, NASA is all over the niche space submarine market.
Titan, a moon on Saturn, has lakes and seas of liquid methane, which NASA is thinking of exploring by 2040. So, instead of rover like the Mars missions use, they will need a submarine. NASA explains the reason for the mission this way:
It's my life, you're just along for the ride! 
This video is really interesting! It’s amazing that something was built to be sent to Saturns moon and although you said they aren’t sure what they are looking for, life is always an option. I am hopeful that they will find something interesting up there and and i look forward to reading any updates on your blog.
Bottom line is we have to keep exploring