On 05Aug2020 0349, xxxxxx@gmail.com wrote:
> ATVs can in theory be made to operate in normal earth-like conditions  > or on planets that have some hairy conditions. In our reality, those
 > vehicles for those settings might be of some similar lineage, but not
 > the same vehicle (because why would you engineer one that can operate
 > without LS, without pressure concerns, without threats of insidious,
 > corrosive or exoctic atmospheres when you are just tooling around on
 > an earth-like planet? You wouldn't... it would drive the price up >
needlessly).
I've always assumed such vehicles, like the standard ATVs in Traveller,
were actually fairly specialist models for sale to people living on
extreme worlds (and their version would have things not necessary to
their environment left off), explorers, and other crazy people like PCs.

> The issue with any climb out of a depth is you need to have  > decompression stops. If you don't, bad things will ensue. Those
stops > are non-trivial time wise depending on depth. They could be
hours or > days.
At shallow enough depths you don't need decompression, even with
extended dive durations. I think it's less than 30feet or so. Thus a
shallow harbour and some airlocks land-side should be fine.

--
Rupert Boleyn <xxxxxx@gmail.com>