Are you considering a trip to Sea World? Before doing so, take a moment to watch the new full length trailer released by CNN films of Blackfish.

Blackfish is the Sundance decuting film about killer whales in captivity and their propensity of living up to their namesake. 

The haunting footage revolves mostly around one whale, Tilikum, responsible for the very public and very horrifying death of a Sea World trainer in 2010.

Are these animals truly killers, or did we make them into killers when we stuck them inside a tank and made them perform for  crowds? That seems to be the essential question at the heart of Gabriela Cowperthwaite’s unsettling documentary.

Watch the trailer for Blackfish:

Blackfish opens in limited release July 19. Here’s the official synopsis:

Many of us have experienced the excitement and awe of watching 8,000 pound orcas, or “killer whales,” soar out of the water and fly through the air at sea parks, as if in perfect harmony with their trainers. Yet, in our contemporary lore this mighty black and white mammal is like a two-faced Janus—beloved as a majestic, friendly giant yet infamous for its capacity to kill viciously. Blackfish unravels the complexities of this dichotomy, employing the story of notorious performing whale Tilikum, who—unlike any orca in the wild—has taken the lives of several people while in captivity. So what exactly went wrong?

Shocking, never before seen footage and riveting interviews with trainers and experts manifest the orca’s extraordinary nature, the species’ cruel treatment in captivity over the last four decades and the growing disillusionment of workers who were misled and endangered by the highly profitable sea-park industry. This emotionally wrenching, tautly structured story challenges us to consider our relationship to nature and reveals how little we humans have learned from these highly intelligent and enormously sentient fellow mammals.