we'll have the latest on that. plus that new pentagon report on ending don't ask don't tell. see what the troops say about serving with openly gay comrades, showering with them, living with them and what both sides of this long and bitter fight say now about the report. we begin tonight with breaking news with an exclusive look inside the drug tunnel recent ly discovered between the u.s./mexico border. it was discovered on thanksgiving but just opened up for us by authorities on both sides of the border this evening. we've been around here before, shown you some incredibly sophisticated tunnels but nothing quite like the one we're about to show you. for one thing it has its own rail network. for another, when the task force located it, they nabbed eight people and more than 20 tons, that's 20 tons of pot. there are two entrances here in otay mesa in two warehouses. we enter as the traffickers did in a nondescript house on a quiet residential street. from the outside it looks like an ordinary two-story house in a residential neighborhood here in tijuana. across the street, a couple