Caring for someone who wants to Self Harm

For issues specific to caring for someone with mental ill health.
My partner has bipolar disorder and is currently stuck in a depressive cycle and has very strong urges to self harm.

Any immediate tips that may help either me to support him or him to channel his desires some other way?
Distraction in some way something you both like doing I think you need to ring co some support from gp and get some help