Small Bathyspheres?? <br /><br />Crazy, <br /><br />On the moon as well as on mars, the issues are pressure differentials, radiation exposure, and temperature differentials. On Venus (in the upper atmosphere) you have no/little pressure differential, reasonable temperature variance, and much less radiation exposure......Heavier? A plastic bag and a few rubber bands would almost do the trick....???? Where do you get heavier?