Aquatic carrier and rudder thereof

An aquatic carrier, comprising:

• a carrier component;
• a fixing component;
• a retractable component, pivoted to the fixing component and having at least a drain hole;
• and
• a first elastic component, connected to the fixing component and the retracted component, supporting the retractable component by elasticity;
• wherein the retractable component compresses the first elastic component and rotates with respect to the fixing component when experiencing external force.

A fin of aquatic carrier, comprising:

• a fixing component;
• a retractable component, pivoted to the fixing component;
• and
• a first elastic component, connected to the fixing component and the retracted component, supporting the retractable component by elasticity, wherein
• the retractable component compresses the first elastic component and rotates with respect to the fixing component when experiencing external force,
• the retractable component includes:
• a first retractable plate, pivoted to the fixing component;
• a second retractable plate, pivoted to the first retractable plate;
• and
• a second elastic component, connected to the first retractable plate and the second retractable plate, supporting the second retractable plate by elasticity, and
• the second retractable plate includes the second elastic component and rotates with respect to the first retractable plate when experiencing external force.