There's twice as much sea as land, and from a brief glance LIDAR penetrates to 300m (whereas google informs me the average depth of the ocean is ~3600m) as well

There's twice as much sea as land, and from a brief glance LIDAR penetrates to 300m (whereas google informs me the average depth of the ocean is ~3600m) as well as presumably some weird topology which might make for interesting challenges. Certainly doesn't sound easy, but it'd be interesting to hear from anyone who works in this area.