HMS Defiance 2 is an action / adventure Half-Life 2 single-player mod in which you play as a hired specialist, Stephen Cartwright, who undertakes a quest for his mysterious captain for reasons, initially, unknown. Set in 1942, HMS Defiance 2 will take you on an adventure like no other.
HMS Defiance 2 video review: Youtube.com
HMS Defiance is a much bigger improvement than it's last iteration. It's still average at best but there is so much more with better story, gameplay, level design and so on. It's still flawed but it's way more interesting.