With lots of secrecy (Balinese dive guides can't keep secrets), we arranged to take the engagement ring in our BCD, while Yosuke and his girlfriend Yui explored the coral garden with a dive guide.
Towards the end of the dive we 'appeared" and presented Yosuke with an underwater slate. He wrote "Yui will you marry me?".
Yui had already spotted the ring box being handed over to Yosuke and so just had to say yes!