If you were supposed to get an email from the forum but didn't (e.g. to verify your account for registration), email Wes at stararmy@gmail.com or talk to me on Discord for help. Sometimes the server hits our limit of emails we can send per hour.
The engines I designed are able to work underwater as MHD Drives. However, there have been disagreements on the speeds and use on the discord. My application on the Plumeria refit (link is wip, will change on approval) has the ship being able to submerge and go 300 kph with shields down and...