Dolphin diving is a tactic formerly used in Battlefield 2, which involved the player going prone while still in midair due to a jump. This was repeated over and over again so that the player could keep moving at a reasonable speed while still only showing their head to their opponent as they would when going prone normally. As a result of pressure from the community, the version 1.21 patch removed the ability to dolphin dive from the game.
had to google it
Dolphin diving is a tactic formerly used in Battlefield 2, which involved the player going prone while still in midair due to a jump. This was repeated over and over again so that the player could keep moving at a reasonable speed while still only showing their head to their opponent as they would when going prone normally. As a result of pressure from the community, the version 1.21 patch removed the ability to dolphin dive from the game.