You pull your legs away from the disgusting object and grab the sides of the sarcophagus with your hands. Arms not so exhausted from the strain of pushing as the rest of you, you heave yourself up and over the side.
Crashing into the mosaic floor, you roll over and get to your feet. Looking down into the tomb you find that the organic tube has extruded thin, snaking black tentacles from its surface, which are spreading outwards from its surface, blindly groping for you.
You back away and try to work out what to do.