The visas would only be available at the Wagah land border crossing near Lahore, and would be issued every day between 10:00 IST (04:30 GMT) and 16:00 IST (11:30 GMT).
But the most striking bits of the book are about the eels' determination to get to their destination, weaving braids of living bodies to climb waterfalls and walls, and even crossingland where necessary.