Apologies for the dearth of posting today. We’re hip deep in a pair of major projects right now, and we spent way too much time sorting through murder-for-hire data this morning. Now we’re off to cold call a bunch of Mexican scientists, who will doubtless chortle at our ugly Spanish. Wish us luck, and please enjoy this small token of our gratitude for your forbearance: a great account of two of the nuttiest (yet subtly ingenious) 19th-century submarines every built. More technical info available via this dead tree (tepidly reviewed here by The Independent).