Good old Greta

notwithstanding the above.

there are 2 narrow exceptions
- internationally recognised criminal activity.
- In order to determine the nationality of the "crew" or the flag state of the vessel.

and obviously anything related to being at war
So which category were they ?
 
Who is going to prosecute them? There is no court of the high seas. I suspect they will claim the action was lawful or simply ignore people and carry on.
UNCLOS.
National governments also legislate and enforce laws within their own territorial waters and Exclusive Economic Zones (EEZs),
For vessels in international waters, the law of the flag state generally applies.
As Israel is prone to ignoring UN resolutions (except the one that they wanted to respect) and War Crimes legislation, they're hardly likely to respect UNCLOS either.
 
40+ boat flotilla...

The Israeli Navy on Friday intercepted the last of the 42 vessels trying to break the maritime blockade on Gaza as part of the Global Sumud Flotilla, with the Foreign Ministry saying it had deported four activists so far out of 470 who were detained trying to deliver symbolic humanitarian aid directly to the war-torn Strip.

40+ boat flotilla...
The Global Sumud Flotilla consists of 500 participants on more than 40 ships from more than 44 countries, making it the largest civilian-led convoy of its kind in history.

Organizers and steering committee​

MemberNotes
Greta ThunbergSwedish climate activist[1]
Ada Colauformer Mayor of Barcelona[2]
Mariana MortáguaPortuguese Left Bloc parliamentarian[2]
Bruno GilgaBrazilian activist (Movimento Revolucionário de Trabalhadores)[2]
Susan SarandonAmerican actress and activist[3]
Mandla MandelaGrandson of Nelson Mandela[4]
Thiago Ávilaactivist, member of the steering committee
Nadir Al-NuriMalaysian activist, member of the steering committee

Number of participants per country​

20px-Information_icon4.svg.png
This list is incomplete; you can help by adding missing items. (October 2025)

NationalityNo. of participants
40px-Flag_of_Italy.svg.png
Italy
22[5]
40px-Flag_of_Malaysia.svg.png
Malaysia
15[6]
40px-Flag_of_Brazil.svg.png
Brazil
40px-Flag_of_Spain.svg.png
Spain
65[7]
40px-Flag_of_Turkey.svg.png
Turkey
21[5]
40px-Flag_of_Pakistan.svg.png
Pakistan
6[8]
40px-Flag_of_Australia_%28converted%29.svg.png
Australia
40px-Flag_of_France.svg.png
France
40px-Flag_of_Sweden.svg.png
Sweden
40px-Flag_of_Colombia.svg.png
Colombia
Total~500
 
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