Click to enlarge. Photo credit: hisutton.com
Both Ukraine and Russia have developed ‘maritime drones’ (USVs – uncrewed surface vessels) with explosive charges. These one-way attack USVs, aka ‘kamikaze’ drones, have been used to attack ships and bridges. The initial design, first seen in September 2022, already employed jet ski parts. However the hull was bespoke. This latest USV is a minimally modified commercial jet ski.
Based on the blurred imagery, the jet ski used appears to be a Kawasaki STX type. The seats, handlebars and some unnecessary casings have been stripped off. Then some communication and control devices have been added.
This seems to show how easy it would be for terrorists to field an offensive unmanned surface kamikaze drone.
Chuck Hill's CG Blog 
According to this report there have been ten Ukrainian USV attacks so far.
https://www.bbc.com/news/world-europe-66373052.amp?xtor=AL-%5B72%5D-%5Bpartner%5D-%5Bsmart.news%5D-%5Bheadline%5D-%5Bnews%5D-%5Bbizdev%5D-%5Bisapi%5D
In my area (CG Sector New York), there’s are many cruise ships and a naval base. Now that every man on a jet-ski will be looked at as a potential suicide bomber, I’m glad I sold my jet-ski!