"I purchased this helicopter along with some other city sets, I was oringally going to buy the Arctic Helicrane but when looked at its size through a display case, I shocked at how small it was, so I picked up the Deep sea helicopter instead. When building this i noticed how roomy it was inside the helicopter which is perfect for storing minifigs and cargo to transport, another thing I liked was that the roters don't come off very easily. I decided to test the strength off the crane with a rather large vehicle I made and it held on, the grapple piece didn't come off. So overall I think this is one off the best helicopters yet. :)"