Talk about missed opportunities! How did we not realize this before? Last year, Arvind and team published a particularly neat concept paper on sinkable microboats for stiffness-tunable lung cultures. Making the boats with a porous hydrogel bottom allowed us to reliably transition cells between submerged and air-liquid interface, needed for lung epithelial cell differentiation and monitoring. One year later, we realized that we had developed an organ-on-a-ship… and will kick ourselves for several years for letting that opportunity for a pun pass us by. Oh well. Water under the boat. That ship has sailed =(