for example, if my laptop is stolen and my house is exploded
I suggest that the initial test run involve renting a safe deposit box at a nearby bank to do your offsite backup storage in. This is probably the best answer as well.
If you want to get fancy, get a larger safe deposit box and pack the HD in an anti-static bag, then in a small layer of protective foam or other material, then a small Pelican or Otterbox case, then more protective foam/etc, then a larger Pelican/Otterbox case, then in the safe deposit box.
As a bonus, you can actually have two or three drives in play. One at your main location with regular backups, one at the bank safe deposit box (optional third "in transit" box so all your backups are never, ever in the same place), and then you can rotate your backups, keeping them fresh.
Or bury it on your own land, I suppose. If you choose to try the burying insanity, be certain to call your local underground line finder first - your hitting a water pipe, gas main, telephone line, cable line, buried electric line, decayed old sewer line, and so on and so forth when you dig is often a MAJOR legal/liability blunder, expensive, and quite frankly dangerous or possibly disgusting.
die from electromagnetic radiation
That's outside the scope of this answer, and won't be caused by stolen laptops or burned down/blown up houses - start by looking into Faraday Cages. These can be nested in the previously mentioned Pelican/Otterbox scenario - research how to best do that.
P.S. Encrypt your backups, of course, in case the drive is stolen in transit to or from the bank (or your car is stolen, or someone digs up your hole).
