Apparently the pilot went too low, realized it and may have tried to gun his engines to climb.

The pilot suddenly realized what was happening and started to climb.

The pilots then realized their mistake and turned the communications system on.

Too late, the pilots realize that the developers are Americans.

So, by the time the pilots realized there were no secret tanks of oil, their own fuel was low.

The young pilot didn't even realize how sweet a deal this was.

The chopper's pilot saw what was happening, and realized quickly that a gun wasn't his best way out of this situation.

When they steadied out, the pilot realized how it had happened.

By the time the pilot realizes something is wrong, it will be too late.

After a short time, the pilot realized that the hospital was a fake, as were the nurses and doctors he had met.