It sounds like the video is saying (link with a time stamp corresponds the following)
In 2013, Grylls found himself in hot water with the local council after erecting a huge metal slide that ended with a drop off a cliff face into the sea below.
I understand the latter part, a huge metal slide.
the question is,
Is "found himself in hot water with the local council" a metaphor? If yes, what does that mean?