Goofs

Mobile network and communications doesn't work inside the cargo container and on the high seas. Mobile phone is unable to work as long as shown in the film in high humidity and without recharging.

While this is an interesting story, there are many plot holes. The biggest of them would be a steel shipping container floating. While it is plausible that these shipping containers (some of them being airtight) might float, with the number of holes in the sides of the container that she was in, there is no way this container would still be floating all those days.

However, no evidence has been provided to support this claim, it's all assumption. The crate is a metal box which floats. Ships are essentially metal boxes which float.