How to get the Danger Swimmer Achievement/Trophy for Sea of Solitude

How to get the Danger Swimmer Achievement/Trophy

To get the secret Danger Swimmer achievement/trophy you must swim for a long distance while the whale is nearby. This achievement/trophy is cumulative and can be easily obtained in Chapter 2 (Dangerous Waters) by turning and swimming in a circle in the space between the buildings. The whale will not be able to get to you as the area is enclosed, simply keep swimming there until the achievement/trophy unlocks.