For the time being I have moved this (and the other one on site) to "ships to be reclassified", pending further info on whetherthe ship is to be completed as something, or just become a "wreck & Relic"

Nektarie thank you for info. Definitely a weird - strange design in my opinion. All her appearance, does not look like a motor yacht.

I finally found some info for this one.
Her name is "FALCON" and she is not a naval ship. She was built in 1982-83 at Elefsis as a commercial motor yacht/tour boat. Her initial owner took a loan from the Greek ETBA Bank in order to build her but he never finished her so the ownership was transferred to the bank. She was bought in 1985 by the Institute of Marine Biology, Crete (ΙΘΑΒΙΚ) using funds from the 2nd European Community Support Framework in order to be converted to a Research Vessel. She was never converted and after the merging of the Institute of Marine Biology, Crete (ΙΘΑΒΙΚ) and the Hellenic Centre of Maritime Research (ΕΚΘΕ) to form ΕΛΚΕΘΕ (www.hcmr.gr) in 2003 the project was abandoned.

The ship is already in Shipspotting at http://www.shipspotting.com/gallery/photo.php?lid=2328406
in the Mystery ships category. Jonathan Simpson's theory about being the ex-FPV JURA seems to be in trouble since the Island-class Wikiwand page states that it was broken up in Portugal in 2001

Hi,
Visible on Google Eath since at least 2009, in many places of Suda Bay, always in military area.
Regards,
Yvon