You stay at dock H-5 and continue to learn to fish. You continuously manage to catch massive fish. At every turn, other fishers tell you they've never seen someone so consistently catch massive creatures. You become somewhat of a local legend.
Unfortuantely, fishing in the Sewers is a pretty high mortality job. After a few years of incredible luck, you slip on a puddle of slime and fall into the water. Usually, this is no big deal. However, all the other fishers coincidentally chose to go on break about five minutes earlier. Even more unluckily, you happen to fall in the water right as a massive mutated shark was prowling by. You're quickly devoured.