rope ladder; jack ladder; ratline
A ladder made of rope, often used on ships, for climbing, or in emergency situations. 綱梯子 is the standard term; 'jack ladder' and 'ratline' are nautical variants.
A rope ladder was hanging from the side of the ship.
The firefighter escaped through the window using a rope ladder.
Compound of 綱 (つな, 'rope') and 梯子 (はしご, 'ladder'). The reading つなばしご reflects rendaku voicing of はしご to ばしご.