A sex offender supposed to be under constant monitoring was allegedly found in bed with a 14-year-old girl.

Police have charged missing diver Colin Smithies with wasting police time after a $50,000 two-day search for him near Porirua turned out to be pointless - as he had hitchhiked to Hawkes Bay.

Police are expected to this afternoon reveal details of why a diver reported to a Hawkes Bay police station after an extensive two-day search for him near Porirua.