Welcome to Ultramarine, which takes a deep dive into the science seeking to understand and protect our precious aquatic world. As anyone who's rolled out of a boat in diving or snorkelling gear into deep water knows, there's nothing as thrilling as entering the ocean and peering inside it.

Whether in warm tropical waters or the shiver- inducing briny of temperate and lower marine environments, Earth's oceans and seas brim with life, wonder and mystery. As 2023 ticks to a close, we wanted to showcase some of the stories that have appeared this year under the Ultramarine banner, and an e-yearbook seemed the perfect vehicle. We have published some 120 stories with a marine focus over the past 9 months; a small selection of those appears in this yearbook.