Whirlpools, eddies and localized down (or up) currents can be found in different parts of the archipelago. The influence of up and down currents can often hard to control by novice divers. Needless to say, their effects can also be significant in the overall course of a dive.
The Galapagos Islands are a great place to take the Drift Diver course and experience real life conditions.
For the rebreather diver a rig bulkier than the usual single cylinder kit, along with increased workload and drag created by currents can become substantial challenges. Ascending and descending currents often unperceivable with open circuit can also represent a source of additional task loading. In addition, strong surface currents and winds over a big open water area can make tracking bubble-less divers a more complex task.