Underground nuclear storage is excessively expensive  Underground nuclear storage is expensive. This is because the deep geological repositories needed to deal with such waste are difficult to construct. This is because said repositories need to be 300m underground and also need failsafe systems so that they can be sealed off should there be a leak. For smaller countries, implementing this idea is almost completely impossible.  Further, the maintenance of the facilities also requires a lot of long term investment as the structural integrity of the facilities must consistently be monitored and maintained so that if there is a leak, the relevant authorities can be informed quickly and efficiently.  This is seen with the Yucca mountain waste repository site which has cost billions of dollars since the 1990s and was eventually halted due to public fears about nuclear safety.1  ISN Security Watch. “Europe’s Nuclear Waste Storage Problems.” Oilprice.com 01/06/2010