Trials.

This is coolbert:

Submarine warfare inherently dangerous even in peace time.

Submersibles posing a danger to the crew EVEN DURING TRIALS AND NOT DURING ACTUAL OPERATION MISSIONS.

Submarines as straight from the shipyard before final acceptance must undergo a series of tests to determine combat worthiness. Worthiness sometimes found to be lacking.

Some instances of such disasters. to include but not necessarily limited to:

1. K Class. K-13. 

"K-13 was carrying out her final acceptance trials prior to the Admiralty officially taking her over from her Clydeside builders, Fairfields."

2. HMS Thetis (N25).

"HMS Thetis (N25) was a Group 1 T-class submarine of the Royal Navy which served under two names. Under her first identity, HMS Thetis, she commenced sea trials on 4 March 1939. She sank during trials on 1 June 1939 with the loss of 99 lives."

3. USS Thresher.

"The second USS Thresher (SSN-593) was the lead boat of her class of nuclear-powered attack submarines in the United States Navy."

"On 10 April 1963, Thresher sank during deep-diving tests about 220 miles (350 km) east of Boston, Massachusetts, killing all 129 crew and shipyard personnel aboard"

4. Russian submarine Nerpa (K-152).

"While K-152 Nerpa was undergoing sea trials in the Sea of Japan on 8 November 2008, a fire suppression system was accidentally initiated. The accident killed 20 civilian specialists and navy crew members and injured 21 others."

SUBMARINE DUTY UNDER ALL CIRCUMSTANCES HAZARDOUS AND LIFE-THREATENING! THIS IS OBVIOUS TO EVEN THE MOST CASUAL OF OBSERVERS AND UNDERSTAND IT FULLY TO BE SO!

coolbert.