Iron and manganese nodules as big as a man's fist cover the sea bed at depths of up to 5,000 m in large areas of the Atlantic and Pacific Oceans.
Intsimbi leyo enobukhulu obungangenqindi lendoda ligquma amazantsi olwandle ayi 50 00m kwindawo ezinkulu ze Atletic nolwandle iPacific