I found a really great seed it is called DIAMONDSTARTERS No spaces or lowercase letters it spawns you near a big ocean and sometimes if your lucky there are under water caves that you can easily find diamonds in. To breathe under water keep putting torches on blocks under water and when it pops of the block you will breath a bit do this repeatedly to easily get to the under water caves if the seed doesn't work keep the words just change it slightly I only tried it briefly.