Little one

It is estimated that at any one time 0.7% of the population of the world (or about 50 million people) are in what state? Solve the crossword, then read down the yellow squares to find the answer.

ACROSS 1 Cut into cubes (5) 4 About to arrive (3) 6 Submerged beneath the waves (4) 7 Acorn tree (3) DOWN 1 Father (3) 2 Spooky noise from an opening door (5)

3 Sir Francis - - -, Elizabethan seafarer (5)

5 The States (3)