How to escape from a helicopter trapped in water ?
If you are ever trapped inside a helicopter  while submerged in water, it’s best to try and remain calm until the cabin is completely underwater. It’s better to wait for pressure to be equalized, before you try to  open the door or break the glass to escape.
Como escapar de um helicóptero preso na água ?
Se estiver preso dentro de um helicóptero enquanto estiver submerso em água, é melhor tentar manter a calma até que a cabine esteja completamente debaixo de água.