Possibly in RC records?

Also have a look at Manx Notebook. This could have been another of David Martin's sons:
On a Sunday in May [1821], David Martin, aged twenty-two, and John Quirk; eighteen, left Castletown for Douglas in a small boat: at Douglas Head the boat capsized, and both were drowned.
www.isle-of-man.com/manxnotebook/fulltext/mxa1901/ch09.htm

Sue