Every overhead environment presents divers with a number of challenges well beyond the scope of recreational diving. These include gas management, lighting, and navigation. Additional risks in these mines will include thermal stress, and potential poor visibility – it is highly likely that the mine contains large deposits of silt including organic mung from rotting wood and other vegetable matter. The initial exploration dive conducted in July 2006 encountered no particular difficulty due to such factors but only a limited area of the mine was visited. Therefore it must be assumed that divers may be faced with these risks during further exploration.