You don’t necessarily have to have ejector seats - WW2 era bombers for example relied on the crew making their way to a hatch to bail out. Despite being a considerably lower chance of survival than modern systems (not helped by various positions having to crawl through narrow spaces to escape and/or find and put on their parachutes due to not having space to wear them during normal operation) the option of bailing out saved a large amount of people.
Looks to be shallow enough to (at least mostly) avoid getting wet feet and the bottom looks firm, I’d give it a go without worrying too much. Could be awkward with the skinny tyres of a road bike but I’m assuming from the lead in and out being dirt that this is a track where one has at least brought a gravel bike.