I was playing AC3, having fun when suddenly I was dragged back to Desmond in that hideous cave - Desmond and the power sources problem. For me nowadays in Assassin’s Creed are rather dull business but in this case it was also time consuming and irritating to actually find where I am supposed to go and climb.
So if you tried to find your way but got annoyed by the all-alike cave setting and have no intention of running back and forth longer than you absolutely must, here's a walkthrough for Assassin’s Creed III power sources problem. This one has several advantages - contains no spoilers of the storyline and is really short (we can spare 5 mins to save us from walking in circles, right?).
If you'd like to make the cave part quicker here it is - a dull part of the game explained by a rather dull-voiced guy:
