Deep Diver

Through years of practice, you are highly skilled at diving deep underwater without magical aid. You gain the following benefits:

• Increase your Constitution score by 1, to a maximum of 20. 
• You can hold your breath for double the normal amount (1 + Constitution modifier minutes) of time before you are at risk for suffocating or drowning. 
• You gain advantage on Athletics checks made to navigate obstacles or rough terrain while you are underwater.