Want to take on a hard survival challenge? Then try this seed out. The spawn is on an island with no mainland to be seen anywhere close to the island. The majority of the island is made out of sand with only some parts grass and two trees. There are no known tunnels under the island which makes it probably quite hard to find good ores too.
So in case you believe yourself being a super good survivor then take on this seed challenge and see how long you can make it.
Seed: caves and mineshafts