After two cancelled dives in the back-arc, we transit to our northern-most destination: Daikoku seamount. The winds and seas are calmer there, and it is a chance to revisit a fascinating underwater volcano. We get the confirmation we have been hoping for at 6.30am - conditions are good enough and ROV SuBastian is ready for its first dive.

The sample will give us the trace element composition of different layers of the chimney, providing a great new insight into how these hydrothermal vent systems are plumbed in.
The team continues taking fluid samples, temperature probes, and filming sites of interest. After completing these and additional tasks, the team decides to call the day and make plans to return to the surface. This will give the crew time to inspect and clean, and ensuring everything is ready to go again tomorrow.

The recovery process is smooth, and once the ROV is back on deck the main thing we notice is the smell - you don’t need any expensive sampler to detect the sulphur here! The crew starts cleaning away and all is soon cleaned off. All the samples taken during the dive are into transported into the labs to begin processing. There is not much time to unload everything, reset, and prepare to go again at first light. This has been an incredibly successful first dive for SuBastian and the team, so everyone is thrilled and excited to go again. You can follow along on the livestream at home as we dive at the same site again: collecting more flatfish samples, more vent fluids for chemistry, and hunting for tubeworms!
