Tales of unlikely survival are probably about as old as the concept of tales. Because if you survived a sabertooth tiger attack, the odds are exceptionally good that you’d want to tell your friends about it over the newly invented fire.
Fortunately, these tales are almost always interesting. “Adrift” tells the real-life story of Tami Oldham, played here by Shailene Woodley (“The Divergent Series”), a young woman traveling the world, in no hurry to get back to San Diego. Along the way she encounters another drifter, Richard Sharp (Sam Claflin, “Journey’s End”), who sails the world because he just plain wants to.