Transit passengers do have to go through immigration and whilst the people there do an excellent job the lack of directions to the transit immigration search area is less than adequate and in fact quite incomprehensible. The queues are long and tedious. The facility is obviously one that has just been thrown up as an ad hoc measure but having had to experience it several times in the last few months I would have thought that a more adequate area could have been built by now. It compares less than favourably with Kuala Lumpur and other airports in this respect. Otherwise a superb airport.