Oh dog. Now I'm reading this article:
https://www.rt.com/news/497212-beirut-ship-explosive-fertilizer-revealed/
> bought by Teto Shipping – a company registered in the Marshall Islands
> owned by a Cyprus-based, Russian-born businessman, Igor Grechushkin 
> The ship sailed under the Moldovan flag
> crew was made up mostly of Ukrainians and Russians.
> In 2013, Rhosus picked up 2,750 tons of ammonium nitrate in the Georgian port of Batumi
> [same year] it was seized by the Lebanese port authorities.
The cargo sat 7 years in the hold of the ship there, a compound of explosives, conveniently next to a war zone, also Hezbollah power base.
Ok. Nothing to speculate about here.