Reading Jules Verne's "20 000 Leagues Under the Seas".
"... These fishermen generally don't live to advanced age: their vision weakens, ulcers break out on their eyes, sores form on their bodies, and some are even stricken with apoplexy on the ocean floor... In Panama they make just $1.00 per week. In most places they earn only a penny for each oyster that has a pearl, and they bring up so many that have none!"