When first announced it seemed a sequel to 2007's smash-hit BioShock was as redundant as it was inevitable. As one of the year's most impressive titles, the original succeeded in delivering one of the most atmospheric standalone experiences of this generation, all while developing a world we could truly get lost in. Much of what made the broken world of Rapture so interesting to begin with – beautiful art deco themes aside – were the many mysteries it harboured. Making use of powerful genetic materials called plasmids, it was your role to traverse this underwater dystopia to unravel the secrets behind its colossal downfall as well as your own place within. While BioShock 2 brings a good deal more to the table with dual wielding and a fresh perspective, the fact these mysteries were explained towards the first's conclusion has left some fans dubious over a second visit. Is this deep-sea adventure worth the same rapturous applause or should we refrain from taking the plunge?