These are usually first detected at the surface by one or more of the following indicators
(Rob Lawrence – African Shark Eco Charters, Chris Fallows – Apex Shark Expeditions):

1. Incoming seals abruptly change course and direction.

2. Seals suddenly switch from porpoising to rapid zig-zag leaping.

3. A group of travelling seals suddenly explode from the water in multiple directions in a star-like pattern.

4. A Great White Shark breaching with or without a seal in its mouth.

5. A bloody splash, often accompanied by a spreading oily slick.

6. Seagulls or other seabirds wheeling over or plunging repeatedly toward a specific area of the sea.