this be about a group of underground tunnel worker in ny who come across some molten lava while dig a new sewer . there also a mad scientist who conduct experiment in geo thermal power which involve dig deep into the earth and use the heat to power a generator or something . that what cause the volcano to start erupt . the woman who come to investigate for the government just happen to be the ex wife of the tunnel digger and and of course we run through the usual cliché of them dislike each other and then get back together over the course of the movie . there also a lot of time spend a some federal bureau come in and shut down the work of our hero and and blame the whole thing on terrorist . yes and someone have to stand in the way of our hero do what must be do and if for no other reason than that it in the handbook of required clichés for disaster movie . overall and it just insanely cheesy and silly and with line like theyre screw with the pressure of the earth crust . another scene involve lava erupt out of a guy house and kill 70 people and but the authority be apparently too stupid to notice the lava ( i would think it would be painfully obvious ) and so they think it be a terrorist bomb . i also get a kick out of how a wood frame house could contain molten lava until the guy open the door . the special effect be funny throughout the whole movie and it add a certain b movie charm i suppose . i especially like the part where a single pistol round be all that require to reroute the lava from one tunnel to another . the acting be pretty spotty and the evil genius guy be prone to scenery chewing and and one of the female character manages to pull off mexican and italian and czechoslovakian accent over the course of her performance . the two main character turn in good enough performance . i say this be not too terrible for a disaster movie because there no sappy melodrama involve kid and pregnant woman and sanctimonious paramedic and or inner city gang member . there no speech by the black or female president at the end say we should have listen to the environmentalist . and best of all and there no little girl look at a bunch of people cover in volcanic ash and say look mommy and theyre all the same color . oddly enough and for a disaster movie and the special effect actually serve a a backdrop for the story and not the other way around . but still it just so tiresomely predictable that it hard to make it through to the end .