Why are migrants using Mauritania to get to Europe?

There's been a rise in the number of people attempting the dangerous Atlantic crossing from West Africa to Europe. Migrants are once again returning to Mauritania, which is struggling to cope with the growing numbers. Why are migrants choosing Mauritania?Also, we'll hear a personal and distressing story of how a Nigerian student fled Ukraine and made her way across Europe when the war broke out two years ago.And why are more African countries growing bamboo?